Most growers ask how soon harvest microgreens and the answer falls between 7-21 days after planting. Fast types like radish finish in about a week. Slower ones like beet take closer to three weeks. Your light, temps, and how big you want them also shift the timing a bit.
I keep a small whiteboard next to my growing shelf. It tracks planting dates and when I expect each tray to be ready. This simple system stops me from forgetting when I started a batch. It also teaches me which types finish fastest in my setup. After a few months you start to just know when things look right without checking notes.
Microgreen harvest time links to two growth stages. First come seed leaves called cotyledons. These look the same for all plants of one type. Then true leaves appear with the shape of the mature plant. Most greens hit peak quality between full seed leaf stage and when first true leaves just start to show.
Research from Utah State gives specific days for popular types. Arugula hits harvest in 6-8 days with its peppery bite. Broccoli needs 8-12 days to fill out right. Pea shoots come ready at 8-10 days with sweet crunch. Radish finishes in 8-12 days with its spicy kick. Sunflower greens mature in 9-10 days with nutty flavor.
Visual clues tell you when microgreens ready to eat better than just counting days. Look for seed leaves that have opened all the way and turned deep green. Stems should stand up straight without drooping or looking stretched. Overall height usually hits 1-3 inches based on the type. Dark rich color means good nutrition and flavor.
I always test for readiness by tasting a single plant from my tray. Snip one stem and chew it for flavor strength and texture. Young greens taste mild. Fully grown ones carry the bold flavor of their adult form. If the taste seems weak, give the tray another day or two before cutting the rest.
Waiting past the best harvest window hurts both flavor and feel in your mouth. Stems turn fibrous and chewy as plants age. Leaves can go bitter or develop off tastes. True leaves starting to appear signals you should cut soon. Better to harvest a day early than a day late for most types.
Your growing conditions speed up or slow down the timeline. Warm temps around 70-75°F (21-24°C) push faster growth. Cool rooms slow things down. Strong light makes compact quick growth. Weak light stretches the time as plants reach toward the source. Match your expectations to your actual setup rather than book averages.
Plan your planting schedule based on real harvest times in your space. Note how many days each type takes from seed to plate under your conditions. Use these personal timelines to stagger plantings. You get steady harvests without gaps or too many trays ready at once.
Read the full article: How to Grow Microgreens Indoors at Home
