GROWING GUIDE
How to grow radish microgreens that hit peak spice
Radish microgreens are fast, profitable, and forgiving. The decision that determines whether they sell or sit is harvest timing, not growing technique.
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Radish is the variety you grow when you want speed. It germinates aggressively, grows fast, and forgives mistakes that would sink a fussier crop. For a new grower who needs an early win, radish delivers it.
It comes in colors too, from bright green to deep purple stems, which makes it a favorite for chefs and a standout in a clamshell. Fast, colorful, and forgiving is a hard combination to beat when you are building a lineup.
No soak, and barely any blackout
Radish does not need soaking. Sow it dry, mist it in, and give it a short, light blackout, often just enough to get the seedlings standing before you bring the light. It is one of the quickest varieties from seed to light of anything you will grow.
That speed is the appeal and the trap. Because radish moves so fast, the entire profitability of the tray comes down to one decision: when you cut it.
The spice clock is the whole game
Radish gets spicier every day it grows. Cut it early and it is mild and crunchy. Cut it late and it can be aggressively peppery, which thrills some chefs and overwhelms most retail buyers. There is no right answer, only the right answer for your customer.
This is why we say radish is won at harvest, not at sowing. Know your buyer, then time the cut to the heat level they want. The timeline below gives you the window so you can dial the spice on purpose instead of by accident.
Forgiving everywhere except the fridge
Radish forgives almost everything during the grow, but it is less forgiving after harvest. Those tender stems bruise if you handle them rough and wilt if you cut them wet. Harvest dry, handle gently, and chill promptly.
Get the harvest timing right and treat the cut shoots kindly, and radish will be one of the most dependable earners on your rack. The cheat sheet below has your numbers.
Radish microgreens cheat sheet
The field-tested numbers from microGREEN FX, in one place. Seed density scales with tray size: a 10 by 20 tray is the baseline, a 10 by 10 is half of it, and a 5 by 5 is one eighth. Match the seed to the tray and you stop guessing.
| Tray size | Seed (dry weight) |
|---|---|
| 10 by 20 (1020, baseline) | 35 g |
| 10 by 10 (half tray) | 18 g |
| 5 by 5 (one eighth) | 4 g |
| Soak | No soak |
| Target pH | 6.0 to 6.5 |
| Typical yield (1020 tray) | about 340 g |
| Days seed to light | 6 days |
Grow timeline for radish
Phases run in order. Harvest day lands at the end of the light phase, and the harvest window is the spread of days you can cut and still get a premium tray. Plan harvest day before you seed and your rotation runs itself.
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