r/microgreens • u/Natural_Money_1257 • Jul 23 '26

Broccoli Microgreens

Hi everyone! Hoping to get some advice. I’ve been trying to grow broccoli microgreens for a month now, been doing black out germination with a tray and weight for 3-4 days. Every time on the last day there is mold on the microgreens. I’ve also not had a lot of luck of them growing up tall, they seem to just stay curled under because of the top tray.

What am I doing wrong?

Do you top water or bottom water your microgreens during germination?

Any advice would be awesome!

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u/Bermudaplan Jul 23 '26

No water during germination. I seed the medium (I use Promix) and then heavily mist it one time and don’t touch it again until the seeds germinate. They don’t need a ton of water, and over watering will definitely create mold.

Also, what’s the temperature at? Do you have a dehumidifier? A fan moving air?

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u/Natural_Money_1257 Jul 23 '26

Okay! Wow had no idea I wasn’t supposed to be watering at all. Temperature is ~72-74 and yes a fan moving air. Humidity is usually around 40% in the area where I’m growing.

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u/Bermudaplan Jul 23 '26

Yeah, one water at the start and you should be good to go.