Hi I have purple cone flower seeds. Can I trade with your bottle brush plant seeds? Please let me know!

You have two threads going on this issue. This being the newest, I'll post here. As noted, you don't say whether this plant started with you as a container grown specimen (came with all its roots) or whether it started with you as a B&B plant (truncated root system, needing recovery). That can inform opinions offered and recommendations therefrom. Your soil pH would be interesting to know, but not necessarily germane to growing this species. Texts say it prefers acid soils that are well-drained, but I've grown it on absolute limestone soils to various circumneutral sites with well-drained to heavy B-horizon clay loams - like here at the Valley, where I've grown over a hundred of these, with the oldest now for over twenty years. I really don't think that bit of yellowing is a matter for concern. It could be a nutrient deficiency that came with container culture; it could be a bit of heat stress that affected that set of leaves as they were forming. I would continue with some iron sulfate if your pH is circumneutral; it won't hurt a thing. Some 10-10-10 in spring as it leafs out and in summer will assist in establishment, as Aesculus parviflora is a gross feeder and robust grower. Given your site description, I'm interested in how you plan to manage this as it matures. As a small canopy tree? Here are some happy old Bottlebrush Buckeyes, doing their summer thing at the Valley...

I have some Spicebush (Lindera benzoin) seedlings of the same size I can trade you.

I learned that the hard way the 1st year I gathered them. I put them in the garage & they all shriveled on me. not at all like the buckeyes on trees. now I plant them right away or store them in a mix of damp sawdust & potting soil. the harvest is nearly done for this year. I do not pick them until the husk starts to open. the trick is getting them before the squirrels do. I shot a squirrels yesterday with one in it's mouth.