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Avatar for marathonnutcase
Apr 24, 2018 8:43 AM CST
Thread OP

Hey everyone,
I'm clearly a newbie. I tried growing a variety of plants from seeds indoors this year. I used Nature's Care Organic Potting Mix from Home Depot (no MiracleGro), watered from the bottom in a plastic tray, LED light 14 hours per day, no additional fertilizer.

The cauliflower sprouted quickly, but then a green moss started on the surface of the soil, but only on the cauliflower side of the tray. The cauliflower are all headed quickly towards death. Similar thing happened last year. Did I water too much? Should they not be in the same tray as tomatoes? I seem to be doing something basic very wrong.Thanks in advance for your help.

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Apr 24, 2018 9:34 AM CST
Name: Frank Mosher
Nova Scotia, Canada (Zone 6a)
Birds Region: Canadian Clematis Lilies Peonies Lover of wildlife (Raccoon badge)
Roses Million Pollinator Garden Challenge Photo Contest Winner: 2017
Welcome to the Forums!! Hurray!
When I start seeds and/or cuttings, and see a green moss substance on top, I know I am overwatering. Additionally, overwatering can lead to "damping off" which is a fungus, which usually results in the seedlings turning dark and wilting at soil level. I don't know where you are, but if you have the time (planting out wise), I would restart some more seeds, and this time, go easy on the watering and find a spray containing sulphur, (a million offerings out there, and I dampen the soil on seedlings when first starting, with such a spray! Remember also, you are dealing with a "cool weather" plant. Cheers! Smiling Welcome!
Apr 24, 2018 9:53 AM CST
Name: Philip Becker
Fresno California (Zone 8a)
I agree with Frank.
Also, Your lites should be on 16 hours, and off 8 hours.
Plus, lites should be as close as possible to plants, without burning them, to prevent legginess.

Anything i say, could be misrepresented, or wrong.
Avatar for marathonnutcase
Apr 24, 2018 10:28 AM CST
Thread OP

You folks are great. Thank you!

I kinda hate the single, cheap black plastic tray I'm using to start all seeds. It slumps in spots, so when I water from the bottom, some plants get too much water, some get none. And the tomato plants get taller faster, so the other plants are further from the lights.

What would be a better seed starting tray or setup? What do most people do when starting many different types of plants?
Apr 26, 2018 9:50 AM CST
Name: Rita
North Shore, Long Island, NY
Zone 6B
Charter ATP Member Seed Starter Tomato Heads I was one of the first 300 contributors to the plant database! Vegetable Grower Lover of wildlife (Raccoon badge)
Birds Garden Ideas: Master Level Butterflies Celebrating Gardening: 2015 Roses Photo Contest Winner: 2016
I just use the same type of black 6 pack seed trays you see your veggies sold in at the nurseries.
Apr 26, 2018 1:06 PM CST
Name: Philip Becker
Fresno California (Zone 8a)
Use something stiff/reddiged !
A tray, metal rack, wood boards, etc.

Use blocks to raise smaller seedlings to same height above lites, as taller seedlings. 👍👍
Anything i say, could be misrepresented, or wrong.
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