Golden Paintbrush

When it comes to watering, Slender Paintbrush should be kept lightly moist at all times. Water regularly, but avoid overly wet conditions. Water every 5-7 days when temperatures are between 60 and 70 degrees Fahrenheit, or every 3-4 days when temperatures are higher than 80 degrees. Provide a thorough soaking when watering, allowing the soil to dry out to about 2 inches below the surface between waterings. Avoid overwatering, as this can increase susceptibility to disease and cause root rot.

Slender Paintbrush thrives best in full sun to partial shade. For optimal growth, it should receive at least 6-8 hours of direct sunlight per day. During the summer months, Slender Paintbrush should receive full sun during the cooler hours of the day and partial shade in the midday. While during the winter months, it's beneficial to allow the plant to receive 3-4 hours of sun per day.

Slender paintbrush (Castilleja gracillima) should be pruned in late summer after flowering has finished. Pruning can help with controlling plant size and in some cases may help promote additional flowering. When pruning, it is important to limit your cuts to 1/3 or less of the total plant. Be sure to remove all dead and diseased branches, as well as any branches that are too long or too dense. This species can also tolerate heavy pruning if necessary.