How to Grow Common Cress
Microgreens
The fastest food you can grow — scatter seeds on Monday and harvest peppery, nutritious microgreens by Thursday; no garden, no soil, no specialist equipment needed, just a tray, some moisture, and a windowsill; year-round freshness from a packet of seeds and five minutes of attention every other day
Cress (Lepidium sativum) has a legitimate claim to being the fastest food crop it is possible to grow from seed anywhere, at any time of year, with the least possible equipment. Scatter seeds on moist cotton wool on Monday. By Wednesday the seeds have germinated and pale hooks are pushing upward. By Thursday or Friday, green stems are standing straight with their seed leaves fully open and the peppery flavour fully developed. Snip with scissors over an egg sandwich and the entire cycle — seed to kitchen table — is complete in under a week.
This speed, combined with the fact that cress requires no outdoor space, no soil, no greenhouse, and no specialist knowledge, makes it the purest expression of what microgreens growing offers: immediate, nutritious, flavoursome food from almost nothing. Children instinctively love it because the results are near-instantaneous by the standards of any other growing project. Adults value it because a small tray of fresh cress, cut and used within days of harvesting, has a flavour and peppery freshness that no shop-bought equivalent can match — the cress in a supermarket has been cut, chilled, transported, and stored for days before reaching the shelf. Home-grown cress goes from tray to table in minutes.
Quick Facts at a Glance
Type
Microgreen / kitchen crop
Time to harvest
5–14 days from sowing
Flavour
Peppery, spicy, fresh — like mild mustard
Equipment needed
Tray · Cotton wool or compost · Water · Windowsill
Season
Year-round — indoors, any month
Difficulty
1 out of 5 — the easiest growing project that exists
Understanding Cress Microgreens
Garden cress (Lepidium sativum) is an annual herb in the mustard family (Brassicaceae), native to western Asia and now naturalised across Europe. As a microgreen, cress is harvested at the seedling stage — typically when the seed leaves (cotyledons) have fully opened and the stem is 3–5cm tall, long before the plant would develop its characteristic deeply lobed true leaves or begin flowering. At this seedling stage the flavour is at its most concentrated and peppery; older cress becomes progressively more bitter and less pleasant to eat.
What "Microgreen" Means — and Why Cress Is the Best Example
A microgreen is any edible plant harvested at the seedling stage — after the seed leaves have opened but before the plant has developed significant true leaves. The seedling concentrates all the energy and nutrients of the seed into a small, densely flavoured shoot. Cress is the quintessential microgreen because it is faster than any other common variety (5–7 days to harvest, versus 7–14 for most), requires the least equipment (no soil needed; cotton wool suffices), and produces a flavour — genuinely peppery, fresh, and distinctive — that is immediately apparent even to those who don't usually notice the flavour of green things.
The Staggered Sowing Method — Continuous Harvest in 5 Minutes Every Few Days
The cress harvest is cut-and-done rather than cut-and-come-again — once you snip the seedlings at the base, the same tray does not regrow. The solution is staggered sowing: keep three or four small trays in rotation, sowing a new one every three to four days. At any given time, one tray is just germinating, one is growing on, and one is ready to harvest. This requires five minutes every few days and produces a continuous, self-renewing supply of fresh cress without any single large batch that overwhelms consumption.
Growing Step by Step
Choose your growing medium: cotton wool, kitchen paper, or seed compost. Cress does not need soil to germinate and grow to harvest stage — its seeds contain enough stored nutrition for the entire microgreen cycle. Cotton wool or several layers of damp kitchen paper in a shallow tray or punnet is completely sufficient. For larger quantities or to produce cress with more substance and root, use shallow seed compost in a tray — the flavour and yield improves slightly with compost over cotton wool.
Dampen the growing medium thoroughly, then scatter seeds densely. The medium should be thoroughly moist — not dripping wet, but damp throughout. Scatter seeds as densely as you like across the surface. Unlike conventional sowing, cress microgreens are grown at extremely high density — the seedlings support each other as they grow and compete in a way that produces straighter, taller stems. Do not press seeds in or cover them.
Cover for the first 2–3 days, then uncover and place in bright indirect light. Cover the tray with another tray, a plate, or cling film for the first two to three days — this maintains humidity and warmth during germination. Keep at room temperature (18–22°C). Check daily and mist gently if the surface is drying out. After 2–3 days, remove the cover — the pale, hooked seedlings will be pushing up — and place in a bright position with good indirect light. Avoid direct harsh sunlight which can scorch tender seedlings.
Harvest with scissors when seedlings reach 3–5cm, seed leaves fully open. Harvest in the morning when flavour is at its peak. Use clean scissors to snip the stems just above the growing medium. Rinse immediately under cold water, shake dry, and use fresh — or refrigerate for up to four days. A small tray of cress is enough for two to three sandwiches or a generous salad garnish.
Using, Eating & Enjoying
The Classic Use — Egg and Cress
Cress on a hard-boiled egg sandwich, egg mayonnaise, or scrambled eggs is one of the oldest and most satisfying British food combinations — the peppery, fresh green flavour contrasting with the rich, mild egg. This is the use that established cress as a British kitchen staple and remains the best single application of freshly cut microgreens. The flavour of home-grown, day-of-harvest cress against a good free-range egg is genuinely exceptional.
Salad, Garnish, and Finishing
Use cress as a finishing garnish on any dish that benefits from peppery freshness: soups (especially cream-based or potato soups, where the pepper provides contrast), smoked salmon, avocado toast, smoked mackerel, any egg dish, roasted vegetables, and hummus. A handful of fresh cress scattered over a finished dish provides both flavour and a visual freshness that dried or wilted garnishes cannot replicate.
Children's Growing Project
Cress is the perfect first growing project for children because the results are visible within 24–48 hours and the harvest comes in under a week — a timescale that a child can genuinely engage with. The classic "cress head" project: carefully remove the top of a hard-boiled eggshell, clean out the interior, fill with damp cotton wool, scatter cress seeds, and watch green "hair" grow on a drawn or painted face within days. The connection between sowing and eating is immediate and tangible.
Nutritional Value
Despite their tiny size, cress microgreens are nutritionally dense — rich in vitamins A, C, and K, along with minerals including calcium, iron, and magnesium. The seedling stage concentrates the plant's nutritional content into a small volume of living tissue. This makes cress — and microgreens generally — significantly more nutrient-dense per gram than the mature herb or vegetable. A handful of fresh cress over a salad or sandwich adds genuine nutritional value, not just flavour.
Year-Round Supply
Unlike garden herbs and vegetables that have seasonal limitations, cress microgreens can be grown on a windowsill at any time of year without any adjustment to method. In winter, slightly warmer indoor conditions may speed germination; in summer, shade from direct harsh sunlight is needed during the hottest part of the day. Otherwise, the method and the timescale remain constant through all twelve months.
No Garden Required
Cress microgreens require nothing that is not already in most households: a clean shallow container (an old takeaway tray, a washed yoghurt pot, a seed tray), cotton wool or kitchen paper, water, and a windowsill. This makes cress accessible to flat-dwellers, people without gardens, and anyone who wants to grow fresh food without any infrastructure. A packet of cress seeds and a few squares of cotton wool are the entire investment.
The Cress Calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 🌱 Sow any time | ||||||||||||
| ✂️ Harvest |
Common Problems & Solutions
| Problem | Likely Cause | What to Do |
|---|---|---|
| Mould or white fuzz on stems | Overwatering; poor airflow; overly dense sowing | The white fuzz on cress stems is usually root hairs rather than mould — a natural feature of the seedling that can look alarming but is harmless. True mould is fluffy, damp, and discoloured. Prevent by ensuring good airflow once the cover is removed, not overwatering (medium should be moist, not wet), and not sowing too densely. Between sowings, wash and dry the tray thoroughly before reuse. |
| Seedlings very pale or yellow | Insufficient light after removing cover | Move to a brighter position immediately. Cress seedlings need good indirect light once germinated — they green up rapidly when given adequate light and revert to pale, weak growth in dim conditions. A south or east-facing windowsill is ideal. |
| Seeds not germinating after several days | Too cold; medium too dry | Check room temperature — cress germinates best at 18–22°C and slows significantly in cool rooms. Ensure the growing medium is consistently moist (not wet) throughout the germination period. In very cold rooms (below 15°C), germination can take up to two weeks rather than one to two days. |
| Bitter taste on harvest | Harvested too late | Cress is most tender and pleasantly peppery at the seed-leaf stage — when the first pair of round seed leaves are open but before true leaves develop. Once true leaves begin to appear (at around 10–14 days), the flavour becomes progressively more bitter. Harvest promptly at 3–5cm, 5–10 days after sowing. |
Growing Specifications
The fastest food from seed — peppery, nutritious, and ready to harvest before the week is out
Scatter seeds on moist cotton wool. Wait five to seven days. Snip with scissors. Scatter over an egg sandwich. There is no growing project simpler, faster, or more immediately rewarding than cress microgreens — no outdoor space, no specialist kit, no seasonal limitation, no waiting. Sow a small tray every three to four days and you have a year-round, self-renewing supply of peppery fresh greens from a windowsill. Start today and eat by Thursday.
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