All guides

15 crops

Lactuca sativa

Growing lettuce

Lettuce is the crop that teaches you how fast a reservoir changes. It goes from seed to plate in under six weeks, tells you immediately when

6 sections →
Solanum lycopersicum

Growing tomatoes

Tomatoes are the heaviest load you can put on a small reservoir: a fruiting plant drinks faster than a leafy one, wants stronger light, and

6 sections →
Ocimum basilicum

Growing basil

Basil is the most useful thing you can grow indoors: quick, forgiving, expensive to buy, and it responds to almost nothing except pinching a

5 sections →
Brassica oleracea & B. rapa

Growing brassicas

Kale, cabbage, broccoli, kohlrabi, pak choi, mizuna — the largest group here, and the one that punishes sloppy isolation hardest. Almost eve

6 sections →
Phaseolus vulgaris

Growing beans

Beans fix their own nitrogen, which changes how you feed them completely. They are also the easiest seed crop in this catalogue — self-polli

6 sections →
Allium cepa, A. sativum, A. porrum

Growing alliums

Onions, garlic, leeks and chives. Slow, undemanding, and almost entirely about day length — which is the one thing an indoor system cannot g

5 sections →
Capsicum annuum

Growing peppers

Chillies and sweet peppers are the same species and will cross without hesitation. They are slow to start, want more heat than anything else

5 sections →
Cucurbita pepo, C. maxima

Growing squash and courgettes

Courgettes, pumpkins and summer squash. Enormous, fast, thirsty plants that will take over a net pot — and the only crop here with separate

5 sections →
Cucumis sativus

Growing cucumbers

Fast, thirsty, and prone to bitterness if the plant is stressed at the wrong moment. Cucumbers want a vertical frame and consistent water mo

5 sections →
Daucus carota, Raphanus sativus, Beta vulgaris

Growing root vegetables

Carrots, radishes, beetroot and turnips. The hardest group to grow in a net pot, because the part you eat is the part that has least room.

4 sections →
Ocimum, Petroselinum, Coriandrum, Anethum, Mentha

Growing herbs indoors

Basil, parsley, coriander, dill and mint. The highest value per square centimetre of anything in this catalogue — and the group where buying

5 sections →
Pisum sativum

Growing peas

Peas fix their own nitrogen like beans, crop fast, and are the most cold-tolerant thing in this catalogue. The main challenge is keeping the

5 sections →
Cucumis melo, Citrullus lanatus

Growing melons

The most demanding thing in this catalogue and the least worth the space in a small system. Grow them because you want to, not because it ma

5 sections →
Various

Growing microgreens

Ten days from seed to plate. The fastest crop in this catalogue and the only one where you harvest the whole plant — which changes everythin

4 sections →
Solanum melongena

Growing aubergines

Slow, heat-hungry and heavy-fruiting. Aubergines are the most demanding of the nightshades and need a long warm season to give anything at a

5 sections →
DarkGrow forum

Talk to other growers

Crop reports, dosing questions and the threads where something died.

Saving the seed

Every crop here can be saved from your own plants, if you get the isolation right.

One email when there is something worth reading

New varieties, seed-saving notes, and corrections to the reference tables. No sales, no fixed schedule.