Hailing from hot, arid climes, such as the Mediterranean and Australia, drought-tolerant plants can withstand prolonged periods of heat with no rain. The majority thrive in full sun, with their roots in well-drained soil or gravel beds that have been enriched with peat-free compost. As our climate changes, they ensure borders are a floriferous show of colour and scent all summer long, without the need to water. The majority love sun-baked, well-drained soil, with some capable of growing in shingle. Plant them all together for an explosion of colour in even the hottest, driest summers.