'Red Rock' is a standout perennial for Houston gardeners looking for high-impact color and low water usage. It is highly resilient in the local summer heat. While it is more tolerant of different soil textures than many desert penstemons, it must have excellent drainage to survive Houston's heavy rainfall. In areas with slow-draining clay, planting in raised beds or amended soil is highly recommended to prevent root rot.
Exposure
Full Sun
Height x Width
24-30" H x 18-24" W
Water
Low once established; drought tolerant.
Zones
7 - 10
Fertilization
Light application of balanced fertilizer in early spring.
Pruning
Deadhead spent flower spikes to encourage repeat blooming. Cut back to the ground in late winter.
'Red Rock' is a standout perennial for Houston gardeners looking for high-impact color and low water usage. It is highly resilient in the local summer heat. While it is more tolerant of different soil textures than many desert penstemons, it must have excellent drainage to survive Houston's heavy rainfall. In areas with slow-draining clay, planting in raised beds or amended soil is highly recommended to prevent root rot.
Exposure
Full Sun
Height x Width
24-30" H x 18-24" W
Water
Low once established; drought tolerant.
Zones
7 - 10
Fertilization
Light application of balanced fertilizer in early spring.
Pruning
Deadhead spent flower spikes to encourage repeat blooming. Cut back to the ground in late winter.
