diff --git a/Project.toml b/Project.toml
index 1243667..5caf2f0 100644
--- a/Project.toml
+++ b/Project.toml
@@ -5,9 +5,12 @@ version = "0.1.0"
 
 [deps]
 CSV = "336ed68f-0bac-5ca0-87d4-7b16caf5d00b"
+DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
 DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
+JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
 Logging = "56ddb016-857b-54e1-b83d-db4d58db5568"
 Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
+Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 
 [compat]
 julia = "1"
diff --git a/data/associations.csv b/data/associations.csv
new file mode 100644
index 0000000..6aa282a
--- /dev/null
+++ b/data/associations.csv
@@ -0,0 +1,62 @@
+name,Liliaceae,Ail,Asperge,Ciboulette,Echalote,Oignon,Poireau,Fabaceae,Fève,Haricot,Pois,Apiaceae,Aneth,Carotte,Celeri,Cerfeuil,Fenouil,Panais,Persil,Solanaceae,Aubergine,Poivron,Pomme de terre,Tomate,Brassicaceae,Chou,Chou rave,Chou rouge,Navet,Radis,Cucurbitaceae,Concombre,Cornichon,Courge,Courgette,Melon,Potiron,Artichaut,Basilic,Bette,Betterave,Bourrache,Capucine,Cardon,Chicoree,Cresson,Epinard,Estragon,Fraisier,Laitue,Mâche,Maïs,Menthe,Oeillet d'inde,Sarriette,Sauge,Scorsonère,Souci,Tétragone,Thym,Tournesol
+Liliaceae,,,,,,,,-2,,,,1,,,,,,,,-1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Ail,,,-1,,,1,,-2,,-2,-2,,,1,,,,,,,,,1,1,,-1,,,1,,,1,,,,,,,,,1,,,,,,1,,1,1,1,,,,,,,1,,,
+Asperge,,-1,,,-1,-1,1,,0,1,0,,,,,,,,1,,,,,1,,-1,,,,,,1,1,,,,,1,,-1,,,,,,,,,,,,,,,,,,,,,
+Ciboulette,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,1,,,,,1,1,,,,,,,,,,,,,,,,,,,,,,,,,,
+Echalote,,,-1,,,-1,,,,,-2,,,,,,,,,,,,,,,,,,,,,,,1,1,,,,,,,,,,,,,,1,,,,,,,,,,,,
+Oignon,,1,-1,,-1,,-1,-2,-2,-2,-2,,1,1,,,,1,,,-1,1,,1,,-1,,,,,,1,1,1,1,,,1,,1,1,,,,1,,,,1,1,,,,,,,1,1,,,
+Poireau,,,1,,,-1,,-2,-2,-2,-2,,,2,1,,1,,,,,,,1,,,,,,,,,,,,1,,,,-1,,,,,,,1,,1,1,,,,,,,1,1,,,
+Fabaceae,-2,-2,,,,-2,-2,,,,,,,,,,,,,,,,1,,1,,,,,,1,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,
+Feve,,,0,,,-2,-2,,,,,,,,,,,1,,,,,1,1,,,,,,,,,,1,,,,,,,,,,1,,,,,1,,,,,,,,,,,,
+Haricot,,-2,1,,,-2,-2,,,0.8,-1,,,1,1,,,1,,,1,,1,,,1,,,,1,,1,1,1,1,1,,,,1,1,1,,,1,,1,,1,1,1,2,,,,,,,1,,
+Pois,,-2,0,,-2,-2,-2,,,-1,0.8,,,1,1,,,,,,1,,1,-1,,1,,,1,1,,1,1,1,1,1,,0,,,,,,,1,,1,,,1,1,,,,,,,,,,
+Apiaceae,1,,,,,,,,,,,1,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Aneth,,,,,,1,,,,,,,,1,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,1,,,,,1,,,,,,,,,,,
+Carotte,,1,,1,,1,2,,,1,1,,1,,,,,,,,,1,,1,,1,,,,1,,,,,,,,,,1,-1,,,,1,,1,,,1,,,-1,,,,1,,,,
+Celeri,,,,,,,1,,,1,1,,,,,,1,,,,,,,1,,1,,,1,,,,,,,,,,,1,,,,,,,,,,,,-1,,,,,,,,,
+Cerfeuil,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-1,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,
+Fenouil,,,,,,,1,,,,,,,,1,,,,,,,-1,,-1,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Panais,,,,,,1,,,1,1,,,,,,,,,,,,,,1,,1,,,,1,,,,,,,,,,,,,,,,,,,,-1,,,,,,,,,,,
+Persil,,,1,,,,,,,,,,,,,,,,,,1,,,1,,,,,,,,,,,,,,,,,,,,,-1,,,,1,-1,,,,,,,,,,,
+Solanaceae,-1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Aubergine,,,,,,-1,,,,1,1,,,,,,,,1,,,1,-1,1,,,,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,1,
+Poivron,,,,,,1,,,,,,,,1,,,-1,,,,1,,,1,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,
+Pomme de terre,,1,,,,,,1,1,1,1,,,,,,,,,,-1,,,-1,,,,,,-1,,,,,-1,,,,,,,,1,,,,,,,,,1,,,,,,1,,,
+Tomate,,1,1,,,1,1,,1,,-1,,,1,1,,-1,1,1,,1,1,-1,0.8,,1,,-1,,1,,,,,,,,,2,,-1,,,,,,1,,,1,,1,,2,,,,1,1,,
+Brassicaceae,,,,,,,,1,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Chou,,-1,-1,,,-1,,,,1,1,,,1,1,,,1,,,,,,1,,-1,,,,,,1,1,,,,,1,,,1,,1,,1,,1,,-1,1,-1,,,1,1,,,,,,
+Chou rave,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,1,,,,
+Chou rouge,,,,,,,,,,,,,,,,,,,,,,,,-1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Navet,,1,,1,,,,,,,1,,,,1,,1,,,,,,,,,,,,,-1,,,,,,,,,,1,,,,,,,1,,,,,,,,,,,,,,
+Radis,,,,,,,,,,1,1,,,1,,-1,,1,,,,,-1,1,,,,,-1,,,-1,-1,,,,,1,,1,1,,1,1,,1,1,,,1,1,,,,,,1,,,,
+Cucurbitaceae,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Concombre,,1,1,,,1,,,,1,1,,1,,,,,,,,,,,,,1,,,,-1,,0.8,,-1,-1,-1,,,1,,,,1,,1,,,,,1,,1,,1,,,,,,,
+Cornichon,,,1,,,1,,,,1,1,,,,,,,,,,,,,,,1,,,,-1,,,0.8,-1,-1,-1,,,1,,,,1,,1,,,,,1,,1,,1,,,,,,,
+Courge,,,,1,1,1,,,1,1,1,,,,,,,,,,,,,,,,,,,,,-1,-1,0.8,,,,,,,,,1,,,,,,,,,1,,,,,,,,,
+Courgette,,,,1,1,1,,,,1,1,,,,,,,,,,,,-1,,,,,,,,,-1,-1,,0.8,,,,,,,,,,,,,,,,,,,,,,,,1,,
+Melon,,,,,,,1,,,1,1,,,,,,,,,,,,,,,,,,,,,-1,-1,,,0.8,1,,,,,,1,,,,,,,1,,1,,,,,,,,,1
+Potiron,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,
+Artichaut,,,1,,,1,,1,,,0,,,,,,,,,,,,,,,1,,,,1,,,,,,,,,,,,,1,,,,,,,1,,,,,,,,,,,
+Basilic,,,,,,,,,,,,,,,,,,,,,,1,,2,,,,,,,,1,1,,,,,,,,,,,,,,,,,,1,,,,,,,,,,
+Bette,,,-1,,,1,-1,,,1,,,,1,1,,,,,,,,,,,,1,,1,1,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,
+Betterave,,1,,,,1,,,,1,,,,-1,,,,,,,,,,-1,,1,,,,1,,,,,,,,,,,,,,,1,,-1,,,1,,-1,,,,,,,,,
+Bourrache,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,
+Capucine,,,,,,,,,,,,,,,,,,,,,,,1,,,1,,,,1,,1,1,1,,1,,1,,,,,,,,,,,1,,,,,,,,,,,,
+Cardon,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Chicorée,,,,,,1,,,,1,1,,1,1,,,,,-1,,,,,,,1,,,,,,1,1,,,,,,,,1,,,,,,1,,,,-1,,,,,,,1,,,-1
+Cresson,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Epinard,,1,,,,,1,,,1,1,,,1,,,,,,,,,,1,,1,,,1,1,,,,,,,,,,,-1,,,,1,,,,1,1,-1,,,,,,,,,,
+Estragon,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Fraisier,,1,,,1,1,1,,1,1,,,,,,,,,1,,,,,,,-1,,,,,,,,,,,,,,,,1,1,,,,1,,,1,,,,,,1,,,,,
+Laitue,,1,,,,1,1,,,1,1,,1,1,,1,,-1,-1,,,,,1,,1,,,,1,,1,1,,,1,,1,,1,1,,,,,,1,,1,1,,,,,,,1,,,,-1
+Mâche,,1,,,,,,,,1,1,,,,,,,,,,,,,,,-1,,,,1,,,,,,,,,1,,,,,,-1,,-1,,,,,,,,,,,,,,
+Maïs,,,,,,,,,,2,,,,,-1,,,,,,,,1,1,,,,,,,,1,1,1,,1,,,,,-1,,,,,,,,,,,,,,,,,,,,
+Menthe,,,,,,,,,,,,,,-1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Oeillet d'inde,,,,,,,,,,,,,,,,,,,,,,,,2,,1,,,,,,1,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Sarriette,,,,,,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Sauge,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,
+Scorsonère,,,,,,1,1,,,,,,,1,,,,,,,,,,,,,1,,,1,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,
+Souci,,1,,,,1,1,,,,,,,,,,,,,,,,1,1,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,
+Tétragone,,,,,,,,,,1,,,,,,,,,,,,,,1,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,
+Thym,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
+Tournesol,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,-1,,,,,-1,,,,,,,,,,,
\ No newline at end of file
diff --git a/data/classification.json b/data/classification.json
new file mode 100644
index 0000000..47d1b6c
--- /dev/null
+++ b/data/classification.json
@@ -0,0 +1,666 @@
+{
+  "name": "God",
+  "type": "Life",
+  "children": [
+    {
+      "name": "Aizoaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Tetragonia",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Tetragone",
+              "bio": "Tetragonia tetragonioides",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Apiaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Anethum",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Aneth",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Anthriscus",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Cerfeuil",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Apium",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Celeri",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Coriandrum",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Coriandre",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Daucus",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Carotte",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Foeniculum",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Fenouil",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Pastinaca",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Panais",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Petroselinum",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Persil",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Asteraceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Artemisia",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Estragon",
+              "bio": "Artemisia dracunculus",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Calendula",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Souci",
+              "bio": "Calendula officinalis",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Chicoree",
+          "bio": "Cichorium",
+          "type": "Genus"
+        },
+        {
+          "name": "Cynara",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Cardon",
+              "bio": "Cynara cardunculus",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Artichaut",
+                  "type": "Variety"
+                }
+              ]
+            }
+          ]
+        },
+        {
+          "name": "Helianthus",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Tournesol",
+              "bio": "Helianthus annuus",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Lactuca",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Laitue",
+              "bio": "Lactuca sativa",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Batavia",
+                  "type": "Variety"
+                }
+              ]
+            }
+          ]
+        },
+        {
+          "name": "Scorsonere",
+          "bio": "Scorzonera",
+          "type": "Genus"
+        },
+        {
+          "name": "Tagetes",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Oeillet d'inde",
+              "bio": "Tagetes patula",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Boraginaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Borago",
+          "type": "Genus",
+          "chlidren": [
+            {
+              "name": "Bourrache",
+              "bio": "Borago officinalis",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Brassicaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Brassica",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Chou",
+              "bio": "Brassica oleracea",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Brocoli",
+                  "type": "Variety"
+                },
+                {
+                  "name": "Chou cabus",
+                  "type": "Variety"
+                }
+              ]
+            },
+            {
+              "name": "Brassica rapa",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Navet",
+                  "type": "Variety"
+                }
+              ]
+            }
+          ]
+        },
+        {
+          "name": "Eruca",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Roquette",
+              "bio": "Eruca sativa",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Nasturtium",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Cresson",
+              "bio": "Nasturtium officinale",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Raphanus",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Radis",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Sinapis",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Moutarde",
+              "bio": "Sinapis alba",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Chenopodiaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Atriplex",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Arroche",
+              "bio": "Atriplex hortensis",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Beta",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Beta vulgaris",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Bette",
+                  "type": "Variety"
+                },
+                {
+                  "name": "Betterave",
+                  "type": "Variety"
+                }
+              ]
+            }
+          ]
+        },
+        {
+          "name": "Spinacia",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Epinard",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Cucurbitaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Cucumis",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Melon",
+              "bio": "Cucumis melo",
+              "type": "Species"
+            },
+            {
+              "name": "Cucumis sativus",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Concombre",
+                  "type": "Variety"
+                },
+                {
+                  "name": "Cornichon",
+                  "type": "Variety"
+                }
+              ]
+            }
+          ]
+        },
+        {
+          "name": "Courge",
+          "bio": "Cucurbita",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Potiron",
+              "bio": "Cucurbita maxima",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Potimarron",
+                  "type": "Variety"
+                }
+              ]
+            },
+            {
+              "name": "Courge musquée",
+              "bio": "Cucurbita moschata",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Butternut",
+                  "type": "Variety"
+                }
+              ]
+            },
+            {
+              "name": "Cucurbita pepo",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Courgette",
+                  "type": "Variety"
+                },
+                {
+                  "name": "Patisson",
+                  "bio": "Ovifera",
+                  "type": "Variety"
+                }
+              ]
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Fabaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Phaseolus",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Haricot",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Pisum",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Pois",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Vicia",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Fève",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Lamiaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Lavande",
+          "bio": "Lavandula",
+          "type": "Genus"
+        },
+        {
+          "name": "Menthe",
+          "bio": "Mentha",
+          "type": "Genus"
+        },
+        {
+          "name": "Ocimum",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Basilic",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Salvia",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Sauge",
+              "bio": "Salvia officinalis",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Sarriette",
+          "bio": "Satureja",
+          "type": "Genus"
+        },
+        {
+          "name": "Thym",
+          "bio": "Thymus",
+          "type": "Genus"
+        }
+      ]
+    },
+    {
+      "name": "Liliaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Allium",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Ail",
+              "type": "Species"
+            },
+            {
+              "name": "Allium cepa",
+              "type": "Species",
+              "children": [
+                {
+                  "name": "Echalote",
+                  "type": "Variety"
+                },
+                {
+                  "name": "Oignon",
+                  "type": "Variety",
+                  "children": [
+                    {
+                      "name": "Oignon blanc",
+                      "type": "Variety"
+                    }
+                  ]
+                }
+              ]
+            },
+            {
+              "name": "Ciboulette",
+              "type": "Species"
+            },
+            {
+              "name": "Poireau",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Asparagus",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Asperge",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Poaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Zea",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Mais",
+              "bio": "Zea mays",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Rosaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Fraisier",
+          "bio": "Fragaria",
+          "type": "Genus"
+        }
+      ]
+    },
+    {
+      "name": "Solanaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Capsicum",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Poivron",
+              "type": "Species"
+            }
+          ]
+        },
+        {
+          "name": "Solanum",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Aubergine",
+              "type": "Species"
+            },
+            {
+              "name": "Pomme de terre",
+              "type": "Species"
+            },
+            {
+              "name": "Tomate",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Tropaeolaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Tropaeolum",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Capucine",
+              "bio": "Tropaeolum majus",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Valerianaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Valerianella",
+          "type": "Genus",
+          "children": [
+            {
+              "name": "Mâche",
+              "bio": "Valerianella locusta",
+              "type": "Species"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "name": "Vitaceae",
+      "type": "Family",
+      "children": [
+        {
+          "name": "Vigne",
+          "bio": "Vitis",
+          "type": "Genus"
+        }
+      ]
+    }
+  ]
+}
diff --git a/data/plants.csv b/data/plants.csv
new file mode 100644
index 0000000..d1d1fe5
--- /dev/null
+++ b/data/plants.csv
@@ -0,0 +1,59 @@
+name,count
+agretti,2
+ail,0
+aneth,2
+arroche,2
+artichaut,0
+asperge,0
+aubergine,0
+basilic,2
+bette,3
+betterave,3
+capucine,0
+cardon,12
+carotte,6
+celeri,3
+cerfeuil,0
+chicoree,3
+chou rave,0
+chou rouge,0
+chou,6
+ciboulette,0
+concombre,9
+coriandre,2
+cornichon,0
+courgette,16
+cresson,0
+cucurbita,0
+echalote,0
+epinard,0
+fenouil,3
+feve,0
+fraisier,0
+haricot,19
+laitue,12
+lavande,0
+mais,6
+melon,0
+menthe,0
+navet,6
+oeillet d'inde,2
+oignon blanc,3
+oignon,12
+panais,6
+patisson,5
+persil,3
+poireau,12
+pois,12
+poivron,0
+pomme de terre,0
+radis,6
+roquette,2
+sarriette,2
+sauge,0
+scorsonere,3
+souci,2
+tomate,19
+tournesol,2
+tetragone,3
+vigne,0
diff --git a/src/GardenOptim.jl b/src/GardenOptim.jl
index 7daf82b..d74f01a 100644
--- a/src/GardenOptim.jl
+++ b/src/GardenOptim.jl
@@ -1,11 +1,16 @@
 module GardenOptim
 
-using DocStringExtensions
 using Logging
+using Unicode
+
+using DataFrames
+using DocStringExtensions
 using CSV
+using JSON
 using Tables
 
-export loadplants, loadgarden, loadcosts, update!, randomgardenevolution!, outputgarden
+export loadclassification, loadplants, loadgarden, loadcosts
+export update!, randomgardenevolution!, outputgarden
 
 @template (FUNCTIONS, METHODS, MACROS) =
     """
@@ -13,9 +18,36 @@ export loadplants, loadgarden, loadcosts, update!, randomgardenevolution!, outpu
     $(DOCSTRING)
     """
 
-function loadplants()::Vector{String}
-    plants = readlines("data/plants.txt")
-    @info "loaded $(length(plants)) plants"
+mutable struct Classification
+    type::Symbol
+    name::Symbol
+    bio::String
+    children::Vector{Classification}
+    parent::Classification
+
+    function Classification(classif::Dict{String, Any})
+        children = [Classification(d) for d in get(classif, "children", [])]
+        type = Symbol(Unicode.normalize(classif["type"], casefold=true, stripmark=true))
+        name = Symbol(Unicode.normalize(classif["name"], casefold=true, stripmark=true))
+        classif = new(type, name, get(classif, "bio", ""), children)
+        for child in children
+            child.parent = classif
+        end
+        classif
+    end
+end
+
+function loadclassification()
+    clf = JSON.parsefile("data/classification.json")
+    clf = Classification(clf)
+    @debug "loaded classification of type $(clf.type)"
+    clf
+end
+
+function loadplants()::DataFrame
+    plants = CSV.read("data/plants.csv")
+    @info "loaded $(size(plants, 1)) plants"
+    plants.name = Symbol.(plants.name)
     plants
 end
 
@@ -30,13 +62,67 @@ function loadgarden(plants::Vector{String})::Tuple{Matrix{Int}, Matrix{Bool}}
     garden, mask
 end
 
-function loadcosts()::Matrix{Float64}
-    df = CSV.read("data/costs.csv")
-    df = coalesce.(df, 0)  # replace missing values by 0
-    costs = convert(Matrix, df[:, 2:end])
-    @info "loaded cost matrix of size $(size(costs))"
-    # ensure the matrix is symmetric: keep the max of itself and its transpose
-    costs = Float64.(max.(costs, permutedims(costs)))
+function loadcosts()::DataFrame
+    df = CSV.read("data/associations.csv", copycols=true)
+    colnames = String.(names(df))
+    colnames = Symbol.(Unicode.normalize.(colnames, casefold=true, stripmark=true))
+    rename!(df, colnames)
+    df.name = colnames[2:end]
+    # df = coalesce.(df, 0.0)
+    @info "loaded cost matrix for $(size(df, 1)) plants"
+    df
+end
+
+# function loadcosts()::Matrix{Float64}
+#     df = CSV.read("data/costs.csv")
+#     df = coalesce.(df, 0)  # replace missing values by 0
+#     costs = convert(Matrix, df[:, 2:end])
+#     @info "loaded cost matrix of size $(size(costs))"
+#     # ensure the matrix is symmetric: keep the max of itself and its transpose
+#     costs = Float64.(max.(costs, permutedims(costs)))
+# end
+
+function getparent(name::Symbol, classification::Classification)
+    if classification.name == name
+        return classification.parent
+    else
+        for child in classification.children
+            parent = getparent(name, child)
+            if !isnothing(parent)
+                return parent
+            end
+        end
+    end
+end
+
+function computecost(costs::DataFrame, plant1::Symbol, plant2::Symbol, classification::Classification)::Float64
+    @debug "$plant1 and $plant2"
+    if plant1 in names(costs) && plant2 in names(costs)
+        cost = costs[costs.name .== plant1, plant2][1]
+    else
+        @debug "$plant1 and $plant2 not in costs"
+        cost = missing
+    end
+
+    if !ismissing(cost)
+        return cost
+    end
+
+    @debug "missing"
+    try
+        parent1 = getparent(plant1, classification).name
+        computecost(costs, parent1, plant2, classification)
+    catch UndefRefError
+        return missing
+    end
+
+    try
+        parent2 = getparent(plant2, classification).name
+        computecost(costs, plant1, parent2, classification)
+    catch UndefRefError
+        return missing
+    end
+
 end
 
 "Return a random index to be filled from the garden mask."