Cross is P. delavayi ssp. melanocalyx × lewisii, neither of which is considered invasive in the East like P. coronarius is. Moreover, this hybrid is sterile anyway -- which is actually the entire reason I am listing it here.
Claimed hardy to USDA zone 3. Flowers appear single and therefore should attract butterflies (as per Sunset, among Philadelphus only the single-flowered varieties do so -- I believe this is because double flowers don't allow butterflies to get at the nectar).
Takes rejuvenation pruning if necessary.
Sources: Sunset, ForestFarm, Missouri BG's pages on other Philadelphus spp./cultivars, and the USA patent filing (PP 18,651).
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