I have a question about using bell jars, soda-bottle "greenhouses", etc. When are things like this helpful, and when are they just making the plant less sturdy? I know that in seed starting trays, that after most of the seeds have sprouted, I should take the plastic dome off and let the little seedlings get some air circulation. With something a little roomier, is it then still helpful to keep the seedlings warmer and more humid than regular room-temp? I have some corkscrew vine seedlings that are just putting on leaves now, and SO want to take good care of them, and just don't know what is best. I have a big bell jar and don't know if they ought to be under there or not, and for how long.
cloche question
I remove the covering on all seeds once they germinate. Whether it is a large or small area that plants are covered with, it makes no difference, they still hold in too much humidity which can lead to development of fungi and then damping off. Cooler temperatures also help root systems develop, regardless of the species. I started my Vigna about two months ago and the top came off as soon as they emerged (even though temps were about 64 degrees. Now, I am trying to contain the vines under lights until I get them moved outside.
Yup, once the seedlings are up they shouldn't need any covering if they are indoors. Here up north we do use cloches, soda bottles etc outside in the early spring to keep plants a little warmer, but they are removed as soon as possible. The warm damp environment they create is just perfect for fungi.
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