New to Bonsai - advice needed

[BigRed]

Hello - I started growing a couple of Bonsai trees last year and I'm not sure what to do about this plant. I started a Delonix Regia from seed last year and one tree started growing and was doing ok. Earlier this year the leaves started drying up and dying off and it is now just a stalk/trunk as can be seen in the picture (2nd from right). I decided to try to sprout another possible replacement and planted another 4 seeds hoping at least one would germinate. Well - three have now germinated and are growing in the pot. This is going to be a crowded situation at some point and I'm trying to determine the best course of action. I'm thinking that maybe I cut off the first trunk and let the other three grow for several months and then transplant to separate pots. Can two of these stay in one pot? The 3 newly sprouted trees are only about 2 months old and I'm not sure how their root systems will be for transplanting, etc. Any advice and suggestions are welcome. I am located in US, growing zone 7.

 

[rockm]

Get them outside. Stop watering so much. Leaf drop like this is likely because the soil is too wet and there isn’t enough light. Indoors is inadequate for any bonsai.

 

[BigRed]

Get them outside. Stop watering so much. Leaf drop like this is likely because the soil is too wet and there isn’t enough light. Indoors is inadequate for any bonsai.

Thanks for the reply! I've been putting them out for about 30 to 40 minutes on warmer days. Not sure how well they do in cooler temps. Thanks again!

 

[Shibui]

No problem transplanting young seedlings. We generally wait until some real leaves have opened as in seedling far right. This usually means the seedlings have hardened up enough so they don't accidentally break. having said that, I often transplant seedlings soon after germination - at about the stage of the left 2. Just need to be a bit more gentle with the more fragile stems.
Young seedlings are able to easily replace lost roots so breaking or cutting some roots while transplanting is no problem. Many of us deliberately cut the long roots to encourage more lateral roots to grow. The younger the seedling the easier it regenerates roots.
It should be warming up enough in KY to be safe for transplanting tropicals like Delonix but if it's still cool these seedlings will wait another month or so.

The alternative is to leave them together for the first year and separate them the following Spring/Summer. You will loose some growth potential because of competition for space, light, water and nutrients but the trunks will be stronger by then.