Answer: Your dwarf black locust trees are probably going through a little transplant shock but they should perk up in a few weeks. In the meantime, water thoroughly and then let the top inch of soil dry out before watering again. One of the problems associated with growing plants in containers is that they dry out fast (especially in hot weather) and they can develop air pockets within the soil mass. So, even though you think you're watering well, the water may just be pouring out the drainage holes rather than wetting the entire root mass. You can counteract this by periodically immersing the pots in a larger container of water and allowing it to sit for 15-20 minutes (until air bubbles no longer rise to the surface). Then take the pot out and allow it to drain well. I do this every 2-3 weeks with my containerized plants. Once you've watered thoroughly, check the soil moisture content by sticking your finger down into the potting soil. If it is dry 1-2" beneath the surface, it's time to water; if it is still moist, check back in a day or two. After you've had your plants for a while you'll be able to judge how often you'll need to water to keep your plants healthy. As long as the soil drains quickly, and you allow the top 1-2" of soil dry out before watering, your black locust trees should be happy in their containers.
Best wishes with your garden!
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