Garden cress microgreens: everything you need to know to grow them

Garden cress microgreens (Lepidium sativum) are the crop we hand to almost every beginner who walks through our door. They are fast, forgiving and genuinely useful in the kitchen, going from dry seed to a peppery, salad-ready tray in a little over a week. If you grew cress on a wet paper towel or an eggshell as a child, this is the same plant, grown a touch more deliberately for a fuller, tastier harvest.

Cress belongs to the brassica (mustard) family, so it shares the warm, mustardy heat of its relatives while being quicker and less fussy than most. It is also a mucilaginous seed, meaning the seed coat turns to a clear gel when it gets wet. That single quirk shapes almost everything about how you grow it, and once you understand it, cress becomes very hard to get wrong.

Why grow garden cress microgreens

Speed is the headline. Few crops reward you as quickly, which makes cress ideal for children, classrooms and anyone who wants an early win before tackling slower greens. There is no soaking step, no seed weight to fuss over, and germination is reliable.

The flavour earns its place too. Cress delivers a clean, sharp, peppery bite with a faint mustard warmth that mellows a little as the leaves grow. If you enjoy that heat, it sits naturally alongside our mustard microgreens and radish microgreens, which share the same family and pace. Cress is the mildest of the three to grow, but arguably the brightest on the plate.

Garden cress microgreens at a glance

Seed soaking	No — the seed is mucilaginous and needs no pre-soak
Germination	2–4 days
Blackout (dark) period	3–5 days, kept brief
Ready to harvest	8–12 days
Difficulty	Easy — a true beginner crop
Flavour	Sharp, peppery, mildly mustardy

How to grow garden cress microgreens step by step

1. Do not soak the seed. Cress forms its own gel from misting alone, so skip the soaking step entirely. Sow directly onto a moist, level growing medium.
2. Sow fairly densely but evenly. Around 15–20 g of seed for a standard 10×20 tray is a good starting point. Scatter it so the gel-coated seeds sit shoulder to shoulder without piling up in clumps, which can trap moisture.
3. Do not use a weight. Mucilaginous seeds stick to the surface on their own and will rot under a stacked tray. A brief cover to hold humidity is all they need.
4. Water lightly and from above with a fine mist. This is the one place cress catches beginners out: the gel holds plenty of water, so it wants far less than most crops. Mist just enough to keep the seeds damp, never soggy. Our watering guide covers the fine-mist technique in detail.
5. Keep the blackout short. Cover for 3–5 days while the seeds sprout, but uncover as soon as the seedlings are lifting the lid. Cress actually likes some light early on, so a long blackout does it no favours.
6. Grow on in bright, indirect light. Once uncovered, keep the tray in good light and continue misting lightly once or twice a day until harvest.

Harvesting and storing

Cress is usually ready between days eight and twelve, once the seed leaves have opened fully and the stems stand a few centimetres tall. Harvest with clean, sharp scissors, cutting straight across a little above the medium — cutting too low picks up grit and the tougher, more bitter base of the stem. A steadier hand at this stage is worth it, and our general harvesting guide is a useful companion.

Cress is delicate and does not store as long as sturdier greens. Harvested dry and kept in a breathable container in the fridge, it will hold for a few days, roughly three to five at best. Avoid washing it until you are ready to eat, as surface moisture shortens its life considerably. For that reason, cress is at its finest cut fresh and eaten the same day.

How to use them in the kitchen

That peppery heat makes cress a natural finishing green rather than a cooking ingredient. The classic pairing is egg — cress on a boiled egg, folded through egg mayonnaise, or scattered over an omelette. It lifts open sandwiches, sits beautifully on smoked salmon, and sharpens a soft cheese or avocado toast.

Treat it as you would a fresh herb: add it at the very end so the heat stays lively and the leaves do not wilt. A pinch over soups, potatoes or a grain bowl adds instant colour and bite. You will find more ideas in our free cookbook.

Common problems

• Mistaking the gel and root hairs for mould. This is by far the most common panic with cress. The clear jelly around the seeds and the fine white fuzz of root hairs along the stems are completely normal. Mould, by contrast, forms grey or cobweb-like strands, usually smells musty, and does not brush off. If in doubt, our mould prevention guide shows the difference clearly.
• Poor or patchy germination from overwatering. Cress is more sensitive to excess water than almost any beginner crop. Soggy seeds sit and rot. Mist lightly and let the surface breathe between waterings.
• Leggy, pale seedlings. Usually a sign the blackout ran too long or the light is too weak. Uncover promptly and give the tray brighter light.
• Bitter, stringy stems. Either the crop was left too long or cut too close to the base. Harvest around the point the seed leaves open, and cut above the mat.
• Using the wrong seed. Always buy untreated, food-grade cress seed rather than agricultural or garden seed that may be chemically dressed. Good seed choice matters for every crop, as we explain in choosing microgreens seeds.

Garden cress is one of those crops that quietly builds confidence: quick, reliable and genuinely delicious. Grow a tray, learn the light touch it wants with water, and you will have fresh peppery greens on hand within a fortnight.

Related: Mustard microgreens, Radish microgreens and our Grow at Home hub.

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The science on cress

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

Cress in the kitchen

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

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