Diascia

Diascia, commonly called twinspur, is a genus that includes annuals and semi-evergreen perennials, so mature size, foliage persistence, flower color, and season vary by species and cultivar. Many make a neat mat of foliage and carry racemes of cup- or bell-shaped flowers, usually pink, with two short spurs; those traits describe the genus broadly rather than this unselected record. ## Choosing a selection This record represents Diascia at genus level, not a named cultivar. Use a cultivar-specific source for mature dimensions, hardiness, color, and flowering dates before selecting a particular plant. The [RHS Diascia profile](https://www.rhs.org.uk/plants/230600/diascia-diastonia/details) provides the genus overview alongside details for the named cultivar Diastonia, so its individual size and red flowers should not be applied to every Diascia. ## Site and placement RHS guidance for the described selection calls for fertile, moist but well-drained soil in full sun or partial shade and recommends watering in dry periods and protecting plants from frost. Suggested placements for that cultivar include hanging baskets, patio containers, bedding, and flower borders; other selections can differ. ## Maintenance For the named Diastonia selection, the RHS says no pruning is required and recommends cutting old stems to ground level in spring. Treat that timing as cultivar-specific; check the chosen Diascia’s own guidance before pruning or assessing winter survival.