Not known to flop at all. Truly much more of a shrub than any sort of herbaceous perennial in our climate, it develops a sturdy woody framework that holds itself up well. Although it can and often does get pruned back hard here in late winter or early spring (similar to buddleia), it more frequently dies to the ground in colder climates, so far less likely to develop that self-supporting woody structure.

Dryland shrub wanting full sun and good drainage, as do lavender, rosemary, rock rose etc. Rounded, spreading gray bush, wider than high - not a vertical herbaceous perennial for typical mixed border conditions. For alternative suggestions describe site conditions, and growth habit etc. desired, including whether spike-shaped (delphinium) or round (aster) flowers are wanted.

I'm not sure exactly how "dryland" shrub translates from a plant native to large areas of the far east. Only resemblance to any of the aforementoned Mediterranean type plants is that it shares a love of sun and good drainage. As do countless other shrubby choices. Not at all sure why one would be discouraged from using in a mixed perennial border -- as stated, in colder climates this is planted and treated as a dieback perennial

Characteristic of limestone soils in nature, like lavender often dies out in gardens if conditions too "good". Shares with aforementioned types the gray foliage of plants wanting sun and good drainage. Rated quite cold hardy, it seems dying down in cold climates might be related to placement in unsuitable soils or problems with climate (or exposure) other than how cold it got.