It is a young tree approximately 3 to 4 years old
Most of the roots are within 6 to 24 inches of the top of the soil. Use the guide below to move a tree or shrub.
https://www.gardeningknowhow.com/ornamental/trees/tgen/transplanting-trees.htm
https://www.gardeningknowhow.com/ornamental/trees/horse-chestnut/how-to-grow-a-horse-chestnut-tree.htm
https://ask2.extension.org/kb/faq.php?id=216419
I am planning to put a Horse Chestnut sapling into our yard that I hope to grow from the conkers of an old one nearby. I have to choose the location. Near the planting location we have the buried pipes for our septic field. My question is how close can I plant the sapling to the field while making sure the roots don't interfere with the pipes? Will the roots start going deep, or will they spread out just under the surface?
Unfortunately, the root system on this tree is considered invasive in most areas, here. I would avoid putting them within 50 feet of anything that you don't want destroyed.
When you do find a suitable spot, this article will help you to care for the tree:
Hi! ?♀️ I followed the information on your blog and was able to germinate a few horse chestnut trees. They grew like crazy in pot for about a month. I transplanted them in April and they haven’t grown since. I’m not sure what to do. Is it because they were transplanted into bigger pots? I’ve tried adding miracle grow and recently I have tried exposing them to a grow light in the evening. Do you know of any tricks or tips to get them to continue to grow? I have been working on this little project since October and feel bad that they are not doing well. I have attached a picture of one of them as well. This one has brown spots because I under-watered it once. Sincerely, Jodie
Unfortunately, this looks to be more related to overwatering, than underwatering. When moved to a larger pot, much of the soil is uncolonized. This will mean less evaporation.
I would treat with a fungicide, and be sure to let the soil dry out, thoroughly, down to about 1/3 of the way down into the container, at least, between waterings.
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/ornamental/trees/horse-chestnut/potted-horse-chestnut-care.htm
https://www.gardeningknowhow.com/ornamental/trees/horse-chestnut
Grew horse chestnut saplings from conkers and two came up so transplanted together and now realize they should not be so close. Do I just cut the small one or try and remove but worried will damage roots of bigger one.
You can cut the smaller one off at the ground. It may grow back but just keep cutting it off at the ground. They are so close, it may disturb the roots of the larger one if you dig it up, as you say.
I had germinated horse chestnut seeds in my crisper from late fall untill they sorouted in very early spring end of winter. After they grew about a foot with 2 big leaves on each i transferred them out to my green house(may month). That night we had heavy frost. The middle buds are growing. But the 1st new leaves are brown and dried up. The middle buds didnt seem to do any growing untill after the frost killed the 1st leaves. Will they be ok?
Likely, they will be fine! They may change shape a little as they adjust to the new growth, but they shouldn't suffer too badly.
https://www.gardeningknowhow.com/ornamental/trees/horse-chestnut