'White Profusion' grew here in zone 6a in central Ohio for many years. At least 15. Most years it was frozen to the ground, resprouted in spring, and flowered beginning in midsummer. It was growing in good silt loam soil with no supplemental water or fertilizer. It would reach about 5-6' most years.

Occasionally we would have milder winters when the lowest temp would not be below 10°F. In those years most of the wood survived. It grew larger and flowered more profusely.

Last winter (2023-2023) was unusually severe. Not so much for extreme cold but for extreme fluctuations. Some things were killed that have been here for years. 'White Profusion' and 2 seedling Buddlejas all were killed.

I never saw seedlings in the vicinity of 'White Profusion'. (However, the area it was growing did not have any open soil.) The seedlings which died were lavenders in a different area from another cultivar (lost name, and it did not survive a winter when the seedlings did).

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