Quote Originally Posted by Garden Knowm
are those cups clear?

don't use clear cups.. light will mix with your moist/soil and things will grow in your container.. next thng you know, you r plants will look like you as a baby..

iloveyou
Hi Knowm!

I know the rule about clear containers but I have actually chosen to go with them for seelding only for this reason:

Being able to see the soil makes it easier for me to judge water use by the plants. If a plant isn't using water as fast as the others, I assume it's not developing roots, and if the difference is very great, I cull it as a runt. Root growth is my main goal in early development.

I try to give seedlings only as much water as they can use in half a day, and water them only when they are DRY but before they show stress to avoid fungus.

The visiblity also allows me to see when the first roots hit the sides of the container, and when it is time to transplant.

Keeping the medium fairly dry has improved my seedling survival rate drastically. I haven't seen pythium in a long time.

I understand about the concerns with 'light poisoning' of the roots, and the possibility of algae growing. Haven't seen algae, it's really too dry.

Works for me anyway.