Kale microgreens: everything you need to know to grow them

Kale microgreens are one of the gentlest ways into growing at home: a fast, forgiving brassica that gives you the familiar cabbage-family character of full-grown kale without the bitterness or the long wait. Sown on a shallow tray of compost or coir, the seed germinates in a couple of days and is ready to cut inside a fortnight. If you have ever grown mature kale and found it a slow, hungry plant, the microgreen version will feel almost too easy — no staking, no caterpillars, no months of waiting, just tender green shoots on the windowsill.

Why grow kale microgreens

Kale sits in the brassica family alongside broccoli, radish and mustard, and it shares their best qualities: quick, reliable and genuinely useful in the kitchen. A few honest reasons to start with it:

• It is about as beginner-proof as microgreens get. There is no soaking, no twice-daily rinsing and no fussy timing — you sow, cover, uncover and cut.
• The flavour is mild. Where mature kale can be tough and bitter, the seedlings are tender and faintly sweet, so they suit people — and children — who normally dislike strong greens.
• It is fast. Most trays are ready in eight to twelve days, so even a single windowsill can keep a small rotation going.
• The method carries over. Once you are comfortable with kale, almost the same routine will grow broccoli, radish, cabbage and rocket.

Kale microgreens at a glance

Seed soaking	Not needed — sow the seed dry
Germination	2–4 days
Blackout (dark) period	3–4 days
Ready to harvest	8–12 days from sowing
Difficulty	Easy — a good first crop
Flavour	Mild, tender and faintly sweet, with a gentle cabbage note

How to grow kale microgreens step by step

1. Choose food-grade seed. Buy untreated kale seed sold for eating or sprouting. Agricultural seed meant for field crops is sometimes coated with fungicide and is not safe to eat as a shoot, so check the label — our guide to choosing microgreen seeds explains what to look for. Red Russian and Tuscan (cavolo nero) both grow beautifully.
2. Prepare the tray. Fill a shallow tray with two to three centimetres of moist compost or coir and level it gently. Do not press it down hard — you want a firm, even surface, not a compacted one.
3. Sow evenly. Scatter roughly 10–20 g of seed (about one to two tablespoons for a standard 10×20 tray) in an even, dense single layer. Kale seed is small, and sowing too thickly is the most common cause of mould, so resist the urge to overdo it. Press lightly for good seed-to-soil contact and mist the surface.
4. Blackout. Cover the tray, or stack a second tray on top, and leave it somewhere dark for three to four days. A light weight helps the shoots root evenly and stand upright, but kale germinates perfectly well without one. Mist if the surface starts to dry.
5. Bring it to the light. When the shoots are lifting the cover and stand two to three centimetres tall, move the tray into bright, indirect light. The pale yellow seedlings will green up within a day.
6. Water from below. Once uncovered, water into the base tray and let the medium wick it up, keeping the leaves dry — wet foliage is what invites mould. Our step-by-step watering guide covers the technique in detail.
7. Grow on and check daily. Give the tray four to eight days of light, keeping it evenly moist. Harvest once the cotyledons are fully open and green, or wait for the first true leaves to appear if you want a slightly larger cut.

Harvesting and storing

Cut with clean scissors or a sharp knife just above the soil line when the seedlings are five to eight centimetres tall, usually eight to twelve days after sowing. Morning is the best time, while the greens are firm. Only wash them if you really need to, and dry them well afterwards — surface moisture is the enemy of shelf life. Stored dry in a sealed container in the fridge, kale microgreens keep for roughly five to ten days. Unlike some herbs, they do not regrow after cutting, so take the whole tray in one go and sow a fresh one to keep your rotation running.

How to use them in the kitchen

This is where kale earns its place. The mild, faintly sweet leaves are gentle enough to eat raw by the handful, so scatter them over soups, dhal and roasted vegetables just before serving, fold them through omelettes and grain bowls, or pile them onto sandwiches and toast in place of lettuce. Because the flavour is soft, they carry strong partners well — lemon, good olive oil, feta, toasted seeds and a little chilli all suit them. Add them at the end rather than cooking them, since heat quickly wilts the leaves and dulls their colour. For more ideas, our free microgreens cookbook has plenty of ways to work through a tray.

Common problems

• Mould. A grey-white fuzzy web spreading across the surface, often with a musty smell, usually means you sowed too thickly, watered from the top or gave the tray too little air. Sow more thinly, water from below and add gentle airflow — our guide to preventing mould goes further. Do not confuse it with root hairs, which are fine white fuzz clustered only around the roots and vanish when misted.
• Leggy, pale shoots. Too little light after the blackout. Move the tray somewhere brighter or add a grow light, and the stems will firm up and green quickly.
• Patchy germination. Usually uneven sowing, a surface that dried out during blackout, or old seed. Keep the medium just moist during the dark phase and start with fresh, good-quality seed.
• Seed hulls stuck on the leaves. Common with brassicas and mostly cosmetic. A light weight during blackout and a gentle mist as the shoots lift both help the hulls drop away.

Kale is one of the best crops to build confidence on, and once you have a tray or two behind you the whole brassica family opens up. Keep a simple rotation going, note down what your kitchen actually gets through, and you will rarely be short of fresh greens. Related: mustard microgreens, the Grow at Home hub, and our full library of crop guides.

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The science on kale

Studies from our Science Library that concern kale microgreens, in plain language with links to the original research. This list updates automatically as new studies are added.

Kale in the kitchen

Recipes and kitchen ideas from our cookbook team that use kale microgreens.

Growing a different crop next? Every variety has a guide like this one in the Varieties database.