I'm in zone 3. I used kitty litter and potting soil to make the ball. I just used extra tree seeds that I had like white spruce, douglas fir and maple and I'd like to make more with elderberry & raspberry and other shrubs. I've purchased air dry terra cotta clay to see if its any better but I'm now wondering if there is any point.

What zone are you in? What medium did you use to make the seed balls? What are the variety of seeds that you used?

I guess I'm more concerned that they won't stay moist during the winter and won't cold stratify. I think maybe I'm just overthinking it. I have a feeling that seed balls work better for wildflower seeds though but we will see. Right now I'm just going to think of this like a cool experiment.

The kitty litter I’m assuming is bentonite clay. Which is used as a litter medium for its extreme water wicking potential (I use bentonite/kaolinite on sandy soils as a wetting agent). You should find that the balls will act as a sponge come the thaw.

Oh really? I guess I was worried that the inside of the ball will get dry. Thank you, this gives me hope.

Cold winters with lots of snow makes me think they'll get plenty cold stratified and the snow will eventually water them. I don't see why it wouldn't work

Hello, I recently made tree seed bombs with seeds that need cold stratification and I'm now wondering if it will even work. After making them, I remembered that for cold stratification to work the seeds need to also be moist. Do you think the seed ball will stay moist enough during the winter? I let them dry for a few days but because it's cool in my basement I don't think they dried completely before I threw them on top of the grass.  I just wanted to try something neat as I had extra seeds and it would be nice to see tiny trees pop up in the spring. We have cold, dry winters with lots of snow if that helps. Thank you

Do seed bombs/balls work with seeds that need cold stratification?