You don't need a garden, a greenhouse, or any growing experience to grow microgreens at home. A tray, a packet of seeds, and a windowsill or grow light, and you're ready to go. In 7 to 10 days, you can harvest fresh, flavour-intense greens from your kitchen counter and have them in a salad the same morning. For growers in Windhoek there's an added bonus: microgreens grown this way need very little water, which counts for a lot in the driest country in sub-Saharan Africa, and every tray you harvest is one less bag of greens trucked up from South Africa.
The three best varieties to start with are radish, pea shoots, and sunflower. Radish is ready to harvest in as few as 5 to 7 days and is among the most forgiving beginner crops available, thanks to its 1 to 2 day germination window and short cycle time. Pea shoots take 10 to 12 days and produce thick, satisfying stems with a mild sweetness. Sunflower comes in at 10 to 14 days with a nutty flavour and one of the highest yields per tray of any variety.
Having the right supplies matters more than most beginners realise. A good tray, clean seeds, and a reliable growing medium make the difference between a predictable harvest and a mouldy disappointment. This guide walks you through every step: what to buy, how to sow, what to do each day, how to fix problems when they come up, and how to harvest and store what you grow.
What you need before you sow your first tray
The basic kit: trays, medium, and seeds
Start with a standard 1020 tray setup (roughly 25 × 50 cm). You need two trays: one solid tray with no holes to act as a water reservoir, and one insert tray or mesh tray with holes so the growing medium can drain properly. Food-safe, reusable trays sized for exactly this setup are worth the investment; cheap single-use trays crack quickly and can't be sanitised reliably between grows. Habitat Hydroponics stocks this style of tray alongside everything else covered in this guide, with fast delivery across Namibia.
For seeds, buy variety-specific microgreen seeds from a hydroponics or specialty supplier. Many garden centre seed packets are coated with additives designed for outdoor bed use; these coatings can affect germination consistency and introduce unwanted compounds in the confined moisture environment of an indoor tray where you're eating what you grow. Stick to uncoated, food-grade microgreen seeds. You'll also need a spray bottle for the first day or two of germination and a small watering can with a gentle rose head for later in the cycle. A good starting point is a purpose-built microgreens kit, which bundles trays, a growing medium, and seeds so you're not sourcing each component separately.
Growing media options in brief
There are three main choices for growing media: potting soil or coco coir, hydroponic fibre grow mats, and mineral media like Grodan rockwool or vermiculite. Soil and coco coir are accessible and beginner-friendly, but they carry a higher risk of mould and fungus gnats in indoor conditions. Jute and hemp fibre mats are clean and lightweight, but they don't provide enough root depth for larger varieties like sunflower and peas.
Mineral media, Grodan rockwool plugs and vermiculite, are the cleanest options for growing microgreens indoors. They retain moisture well, support strong root development, and provide no organic matter to fuel mould growth. A full comparison of all three is covered below, but if you want the most reliable setup from day one, mineral media is the answer.
How to grow microgreens at home: choosing the right seeds
The fastest and most reliable varieties to start with
Radish is the single best first crop for anyone new to growing microgreens indoors. It germinates in 1 to 2 days, sometimes faster with a heat mat, and is ready to harvest in 5 to 7 days. The flavour is spicy and peppery, and because the cycle is so short, a failed tray costs you almost nothing to restart. Pea shoots germinate in 2 to 3 days and reach harvest in 10 to 12 days. They're mild and crunchy, and their size and yield make them one of the most satisfying crops to grow. At heavier commercial seeding rates, pea shoots can yield upward of 397 to 454 grams per tray; lighter home seeding densities typically fall in the 170 to 280 gram range.
Sunflower germinates in 2 to 3 days and is ready in 10 to 14 days, yielding 225 to 340 grams per standard tray. Soak sunflower seeds for 8 to 12 hours before sowing to soften the hull and speed germination. Once you've run two or three successful trays of these three varieties, broccoli and mustard are worth adding to the rotation. Both germinate in 1 to 3 days and are harvested in 8 to 10 days. Mustard adds a sharp peppery bite; broccoli is milder with a solid nutritional profile.
What to look for when buying microgreen seeds
Check the germination rate listed on the pack and aim for 90 per cent or higher. Anything below that will give you patchy, uneven trays that are frustrating to manage. Buy whole, uncoated seeds only. Pre-coated or pelleted seeds don't perform consistently in the confined moisture environment of a compact tray, and they're almost never sold by dedicated hydroponics suppliers anyway.
Sourcing from a specialty store rather than a bargain seed rack also means your seeds haven't been sitting in a warm warehouse for two seasons. Fresh seeds with a high germination rate are the single biggest factor in whether your first tray succeeds or fails.
Microgreens soil vs. hydroponic media: which to use at home
Potting soil and coco coir
Standard potting mix is widely available and gets the job done, especially if you already have a bag at home. Use a shallow layer of about 2.5 to 3 cm; microgreens don't need depth, they need moisture retention and root support. Coco coir is a cleaner step up from potting soil with better moisture consistency and no nutrient load that might interfere with your seedlings.
The downside of both options in an indoor setting is that organic matter in the medium can fuel mould growth. If you overwater even once during germination, you're likely to see surface mould within 48 hours. Fungus gnats are also a persistent problem with soil-based setups kept indoors year-round.
Hydroponic grow mats
Jute fibre and hemp mats are purpose-built for microgreens trays. They lay flat, hold moisture evenly, and produce no mess or debris at harvest. For radish and broccoli, they're excellent. For sunflower and pea shoots, they fall short because these larger varieties need slightly more root depth than a thin mat can provide.
Grodan rockwool and vermiculite: the clean-room approach
Grodan rockwool plugs are an inert mineral fibre medium that offers excellent moisture retention and root aeration with no organic matter to feed mould. They're the closest thing to a controlled growing environment you can achieve at home without specialised equipment. Rockwool is particularly effective in warmer or more humid kitchens where mould pressure runs higher than average. Habitat Hydroponics stocks Grodan plugs in Windhoek alongside the trays and other supplies covered in this guide.
Vermiculite is a distinct mineral medium that works well as a top-dressing layer applied over soil to reduce surface mould. It also performs as a standalone medium for light-seeded varieties like radish and mustard, though it behaves differently from rockwool in terms of compaction and moisture distribution. Some growers combine coco coir and vermiculite at roughly a 60:40 ratio to get the moisture consistency of coir with the drainage and aeration of vermiculite. For anyone who wants clean, predictable results from their very first tray, Grodan rockwool or a coir-vermiculite blend is the setup to use.
How to grow microgreens at home: light, water, and the 7 to 10 day schedule
Days 1 to 4: the blackout germination phase
After sowing, stack a second solid tray on top or cover with a blackout lid. Darkness during germination encourages even sprouting and drives roots downward before the shoots push upward. Check moisture daily and keep the medium feeling like a wrung-out sponge: damp throughout but not dripping. Most varieties show visible sprout activity within 48 to 72 hours; radish can pop in 24 hours flat.
Sunflower needs 48 hours of blackout before light exposure. Pea shoots benefit from a slightly longer blackout of 72 to 96 hours, which encourages stronger stem development before they're transitioned to the light phase. Keep the cover in place and resist the urge to check too often; consistency matters more than curiosity during this phase.
Days 4 to 10: light exposure and daily watering
Once shoots are 2.5 to 5 cm tall, move trays under a light source or onto a bright north-facing windowsill (north catches the sun here in the southern hemisphere). Microgreens need 12 to 16 hours of light per day, with an LED grow light positioned 15 to 30 cm from the canopy. If you have a light meter, aim for 125 to 175 µmol/m²/s PPFD. For home growers without meters, a decent LED shop light or grow panel at 15 cm delivers a good approximation.
Switch to bottom-watering as soon as roots are visible at the base of the insert tray. Pour approximately 500 ml of water into the outer solid tray and let the medium absorb from below via capillary action. This keeps the canopy dry and cuts mould risk significantly. Check tray weight daily: if it feels light, add water; if it still feels heavy from the previous session, wait. Most home setups need bottom-watering every 1 to 3 days, not every single day. If you're curious about your source water, test your own tap water before assuming anything; a simple test tells you far more than generalisations.
The daily 60-second check
Each day, scan for even green colour across the canopy, upright stems, and no pooling water in the base tray. Pale or leggy growth means insufficient light. Mould on stems or at the base of the medium means too much surface moisture or poor airflow. Both are fixable if you catch them early, and both are covered in the next section.
Fixing the three problems that kill most first trays
Mould on the stems or growing medium
Mould almost always traces back to overwatering, poor airflow, or seeds sown too densely. Switch to bottom-watering immediately if you haven't already, add a small fan near the tray to keep air moving across the canopy, and reduce seed density on your next sow. Good airflow is not optional: stagnant air keeps surfaces wet longer and lets mould spores settle.
If mould appears in a small isolated section, spray diluted hydrogen peroxide at 3 per cent directly onto the affected area and boost airflow around the tray. Remove the entire affected section if it spreads beyond that first patch. Don't confuse white root hairs with mould: root hairs are fine, wispy, and disappear quickly once light and airflow reach them. Mould is fuzzy, grey or greenish, and has a distinct smell.
Poor or uneven germination
Uneven germination is almost always caused by old seeds, a medium that dried out during the blackout phase, or inconsistent cover placement letting in light. Confirm your seeds have a 90 per cent or higher germination rate and store them in a cool, dry place between uses. Keep the medium consistently moist during germination and ensure the blackout cover sits flat with no light gaps around the edges.
Large seeds like sunflower and peas must be soaked 8 to 12 hours before sowing. Skipping the soak leads to slow, patchy germination and a tray that never fully fills in.
Leggy, pale, or falling-over growth
This is a light problem, full stop. Microgreens growing without adequate light will stretch aggressively toward any weak ambient source, producing long, pale, floppy stems with poor flavour. Move trays closer to your light source or invest in a dedicated LED panel. Even in Namibia, where outdoor sunlight is strong most of the year, the light that actually reaches a tray indoors through a window is far weaker than it looks, and a north-facing windowsill alone rarely delivers enough intensity for compact, upright microgreens.
12 to 16 hours of consistent, direct light daily is the baseline. If your current setup can't deliver that reliably, a basic LED grow light panel is one of the most impactful purchases you can make for consistent indoor growing results.
How to harvest and store your microgreens properly
When and how to cut
Harvest microgreens just before or right as the first true leaves begin to appear. At this point, the cotyledons are fully open, the stems are firm, and both flavour and nutrient concentration are at their peak. For radish, that's day 5 to 7 once the seed leaves are fully spread. For pea shoots and sunflower, wait until day 10 to 14 when stems are upright and leaves are fully unfurled.
Use clean scissors or a sharp knife and cut just above the surface of the growing medium. A single tray of sunflower yields 225 to 340 grams; radish comes in at roughly 170 to 280 grams depending on sowing density, while pea shoots at typical home seeding rates fall in a similar range. Harvest in the morning if possible; that's when sugar concentration in the leaves is highest and flavour is at its best.
Storing freshly harvested microgreens
Do not rinse microgreens until you're ready to eat them. Moisture accelerates decay faster than anything else in the refrigerator. Store dry in a rigid, airtight container lined with a dry paper towel at the bottom, with another paper towel layer on top to absorb any condensation that forms against the lid. Refrigerate at 1 to 3 °C in the crisper drawer, away from ethylene-producing fruits like apples and bananas, which accelerate yellowing.
Most varieties stay fresh and usable for 7 to 10 days under these conditions, with careful handling extending that closer to 10 to 14 days. Pea shoots hold well toward the longer end of that range. Radish tends to soften faster than the others, so use it first if you're harvesting multiple varieties at once.
Start your first tray this week
Growing microgreens at home is one of the fastest and most accessible ways to add fresh food to your kitchen. The process is repeatable: choose fast-germinating seeds like radish, pea shoots, or sunflower; pick a clean medium such as rockwool, vermiculite, or a fibre grow mat; follow the blackout phase with consistent light exposure; bottom-water from day four onward; harvest just before the first true leaves fully open.
Your first tray is a learning tray. It won't be perfect, and that's fine. A second tray is only 7 to 10 days away, and everything you learn on the first one makes the second one better. The gap between a poor tray and a great one is usually just one small adjustment: more light, less water, or fresher seeds.
When you're ready to get started, Habitat Hydroponics carries microgreen trays, Grodan rockwool plugs, and vermiculite, stocked locally in Windhoek with fast delivery across Namibia, so you can source everything in one place. Check the store for current pricing. Once you've grown microgreens at home for the first time, the next tray is already in the back of your mind.
Frequently asked questions
How long do microgreens take to grow? Radish is ready in 5 to 7 days; pea shoots and sunflower take 10 to 14. From sowing to salad is under two weeks for every beginner variety.
Do I need a grow light to grow microgreens at home? Usually, yes. A windowsill delivers far less light than it looks like it does, and weak light means pale, leggy stems. Aim for 12 to 16 hours a day under an LED panel positioned 15 to 30 cm above the canopy.
Why did my microgreens go mouldy? Almost always overwatering, poor airflow, or seeds sown too densely. Switch to bottom-watering, add a small fan, and sow lighter next time. Small patches can be treated with 3 per cent hydrogen peroxide and more airflow.
How do I store harvested microgreens? Dry and unrinsed, in an airtight container lined with paper towel, at 1 to 3 °C in the crisper drawer. Most varieties keep 7 to 10 days; only rinse them when you're about to eat them.
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