Propagation forum: Coleus Seedlings

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Name: Sandi
Franklin, WI (Zone 5a)
I was one of the first 300 contributors to the plant database! Daylilies
Mar 20, 2015 6:45 AM CST
I can't ever get these to grow past the initial 2 leaf stage. I've tried several years in a row. They just don't grow despite heating mat, ample light etc. Any wisdom?

Name: Anne
Summerville, SC (Zone 8a)
Only dead fish go with the flow!
Plant and/or Seed Trader Enjoys or suffers hot summers Hybridizer Birds Seed Starter Cat Lover
Pollen collector Moon Gardener Hibiscus Greenhouse Dragonflies Garden Ideas: Master Level
Mar 20, 2015 3:21 PM CST
Hi Sandi, it could be a number of things .. what exactly happens? Do they just shrivel up and die or do they kind of fold over on themselves and dry up? Are you seeing fuzzy patches on the seedlings stems? And are you using the same soil over and over?

It might be 'damping off' which is a fungal problem. Try a new batch with fresh soil and sprinkle some cinnamon, it's a natural anti-fungal on the top of the soil. You also want to keep the soil on the dry side of moist and use water that has been boiled and cooled. The chlorine level in your tap water may also be causing a problem. Set the heat mat to be on the cool side .. soil temperature in the low to mid 70's.
"Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do, so throw off the bowlines, sail away from safe harbor, catch the trade winds in your sails. Explore, Dream, Discover."

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Name: Caroline Scott
Calgary (Zone 4a)
Charter ATP Member Region: Canadian Bulbs Winter Sowing Enjoys or suffers cold winters Lilies
Peonies Plant Lover: Loves 'em all! Garden Ideas: Master Level
Mar 20, 2015 7:00 PM CST
I think that some varieties of coleus like cooler growing conditions.
Last year i moved mine away from the heat from the lights.
Name: Clint Brown
Medina, TN (Zone 7b)
Hellebores Hummingbirder Heucheras Winter Sowing Cactus and Succulents Container Gardener
Ferns Bee Lover Cottage Gardener Garden Procrastinator Clematis Birds
May 7, 2015 10:13 AM CST
I mix a little hydrogen peroxide with the water when I plant my seeds.

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