I haven't personally grown a Redbud tree indoors, but I have done a lot of research on it and know a few people who've tried. Redbuds are indeed strikingly beautiful with their vibrant flowers, but growing them inside can be a bit challenging. Most often, these trees do better outdoors due to their size and natural growth habits. However, it doesn't mean you can't try with the right approach!
Firstly, when it comes to light, Redbuds need plenty of bright, indirect sunlight. They can tolerate some direct sunlight, but indoors, it's crucial to place them near a window that receives ample natural light, like a south or west-facing window. You might find using a grow light beneficial, especially during the darker months.
Regarding soil, they prefer loose, well-draining soil. A mix similar to cactus soil, which balances drainage and moisture retention, would be ideal. Overwatering can be detrimental, so make sure the pot has good drainage holes.
Moisture is another key factor. While Redbud trees appreciate consistent moisture, they don't like being waterlogged. It's essential to let the top inch or so of soil dry out between waterings.
As for varieties, the Eastern Redbud (Cercis canadensis) is the most common, but you might find dwarf varieties like the 'Ace of Hearts' or 'Little Woody' more suitable due to their smaller size and more compact growth habit, which can make them more manageable indoors.
Lastly, one of the major considerations is space. Redbuds, even the dwarf ones, can grow quite large over time. You'll need to have a plan for either moving them outside eventually or continually pruning to manage their size.
From what I've read and heard, growing a Redbud indoors can be quite rewarding if you can mimic their natural outdoor conditions as closely as possible. If you're into experimenting and enjoy a challenge, it might very well be worth a try. It'd be great to hear back on how it goes if you decide to pursue it. Maybe start a thread about it; it could be a really interesting project! Have you considered any other types of indoor trees as an alternative in case the Redbud proves too difficult?