It's really really hot! Here's how to conserve water. Avoid digging! In hot dry weather, keep tilling the soil to a minimum, as this causes water…
They are fully to half hardy, and will grow well in full sun and not over rich, well drained soil. Resents being transplanted.
You can propagate the species by softwood or basal cuttings in the summer or by seed in the autumn, selected forms by softwood cuttings only in summer.
Pests, diseases or disorders
Prone to aphids.