Update: My online research says inter-species graft within Salix should work fine. The vendor website via Wayback Machine circa 2023 says: "Kits are typically filled with varieties of S. purpurea or S. miyabeana". The dome willow looks dissimilar to either kind, at least the named varieties they offered for basketry we also grow close to the dome. The dome willow is growing branches that are the similar size as S. purpurea. Unhelpfully, it looks most similar to a wild willow we propagated from a road side shrub in Wisconsin (USDA Zone 4b) even a match for being susceptible to this tattered pale leaf situation from late summer onward at least at our location and growth condition. Maybe too humid and hot. For people looking for good cultivar or species for willow dome in east coast zone 7, I would recommend a named cultivar of S. purpurea, or S. miyabeana because their leaves look fine this year.…