Sunset hyssop prefers a hot, sunny spot in well-drained, mineral-rich, humus-poor soil. Cut the fine-textured, somewhat brittle stems down close to the ground at the beginning of the growing season, even if much of the wood remains live, as it does in warmer zones. This radical pruning promotes sturdier, more vigorous growth.
Sunset hyssop is short-lived in damp, cool climates and resents moist winter soil. Otherwise it appears to adapt to most garden situations as long as it has full sun. Its warm colors and full, bushy texture combine well with late-season grasses such as Mexican feather grass (Stipa tenuissima, syn. Nassella tenuissima) and the taller big sacaton (Sporobolus wrightii), two other lovely Southwest natives. Late- blooming, similarly drought- tolerant plants such as blue mist spirea (Caryopteris X clandonensis), Russian sage (Perovskia spp. and hybrids), and Maximilian sunflower (Helianthus maximiliani) also make good companions. This recently discovered treasure offers lively color and delicious fragrance, while bringing wildlife into our late-season gardens.