Het Groente Genootschap is a self-picking farm located in Castricum and Heemskerk, where members can harvest local vegetables, herbs, and small fruits on a weekly basis. The farm operates according to organic and ecological principles, focusing on biodiversity and soil health. A flower forest for self-picking bouquets is also available at the Castricum location.
Self-pick produce includes a wide variety of vegetables such as lettuce, fennel, courgette, pumpkin, endive, palm kale, chioggia beets, patisson, turnip tops, and Jerusalem artichokes. Fresh herbs like coriander, basil, parsley, mint, and thyme are available throughout the season, along with edible flowers. The picking season runs from May to December, offering approximately 32 weeks of harvest. In spring, 4 to 7 types of vegetables are available weekly, increasing to 8 to 10 types in summer and autumn, and ending with winter vegetables in November and December.
The farm has two main locations. At De Zanderij in Castricum, picking hours are from Thursday 16:00 to Saturday 13:00. At Kasteel Marquette in Heemskerk, picking hours are Friday 09:00 to 17:00 and Saturday 09:00 to 11:30. The farm is open Tuesday 09:00-15:00, Thursday 09:00-17:00, Friday 09:00-17:00, and Saturday 09:00-13:00, and is closed on Monday, Wednesday, and Sunday.

