Member Since: 02/24/2010

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Re: Seed Starting in Speedling Trays

Tall and spindly plants are caused by not enough light. More specifically, not enough blue light. This is also called etoliaion. Seedlings need bright blue when they emerge, or they will stretch to find it.

Growing indoors can cause this problem. You need to grow plants indoors close to a window, and you may still need to provide supplimental lighting. You need a daylight, or cool color temperature bulb. T5, or compact fluorescents are good for this purpose.

When plants start flowering, they need more red light.

Blue light = normal compact growth, germination inhibition.

Red light = Sugar production, seed germination (breaks dormancy).