During the spring of 2017 I tried to plant a few tamarind seeds that I picked up from one of my travels. Two of them are growing quite well but the plants are just growing vertically, without any "strong" secondary branches.
Now they are around 40 cm (15 in) high (without the pot) and I really don't know how to prune them. Since I'm not an expert when it comes to tropical plants, can someone please help me or give me some suggestions about how I should prune it? Is winter the right season to prune it?
I'll be changing the pots soon because they are getting too small for the size of the plants.