Skullcap
Skullcap
Location on Farm:
🌱 Planting Installation
Skullcap, is a tough, woody-based herbaceous perennial subshrub prized for its fine-textured foliage and continuous flowering. Growing as a compact, low-mounding cushion six to ten inches tall with a spread up to eighteen inches, it features tiny, grayish-green, slightly aromatic leaves on thin, square stems. From late spring through autumn, the plant is covered in small, two-lipped tubular blossoms ranging in color from deep cherry-pink to vibrant violet-blue. Its common name comes from the unique, helmet- or cap-like shape of its persistent seed calyxes. Overall, Skullcap is ideal for rock gardens, edging pathways, retaining wall spillovers, and low-water xeriscapes because it provides a dependable groundcover without becoming invasive.
| Scientific Name | Scutellaria spp. (Primary landscape species include Scutellaria suffrutescens [Pink Skullcap/Texas Rose] and Scutellaria resinosa [Resin Skullcap]) |
| Foliage: Semi-evergreen to Evergreen |
Low-growing, woody-based herbaceous perennial subshrub forming a dense, compact, mounding cushion. Leaves: Small, opposite, oval to linear, medium-green to grayish-green leaves (1/2 in long); slightly aromatic with fine pubesence; semi-evergreen in mild winter climates. Flowers: Small, snapdragon-like or helmet-shaped, two-lipped tubular flowers borne in leaf axils along upper stem tips; colors range from deep cherry-pink (S. suffrutescens) to deep violet-blue (S. resinosa); heavy bloom late spring through autumn. Fruit: Inconspicuous, small, helmet-shaped, two-valved seed capsules (calyx features a characteristic protective "dish" or "cap" lid). Seeds: Four tiny, rough, dark brown to black nutlets contained within each dish-like calyx. Bark: Soft, square green stems when young, aging to delicate, thin, woody stems at the crown base. |
| Life Span: Perennial | 10–20+ years |
| Mature Height | 6–10 in (Pink Skullcap); up to 12–15 in for larger native woodland species |
| Mature Width (Spread) | 12–18 in |
| Growth Rate | Moderate |
| USDA Zone / Chill Hours | USDA Zones 7a–10b (Root hardy down to 0°F to 5°F); No chill hours required |
PLANT CARE & CHARACTERISTICS
Light Requirements: Full Sun to Partial Shade (Requires 4–6+ hours of direct sunlight daily for dense foliage and prolific flowering).
Water Requirements: Low; thrives with minimal supplemental watering once established.
Drought Resistance: Exceptional (Highly adapted to hot, dry climates, rock crevices, and xeriscapes).
Soil Type: Adaptable; prefers dry, lean, sandy, gravelly, or alkaline limestone soils; pH 6.5–8.0; strictly requires sharp drainage to prevent root rot.
Deer Resistance: Very High (Aromatic, resinous leaves naturally deter deer and rabbits).
Pest / Disease Resistance: Exceptional resistance to pests and diseases; main threat is crown or root rot caused by wet, poorly drained soils.
Pollination: Insect-pollinated; flowers attract bees, butterflies, and hummingbirds.
Harvest: Harvest leafy stems during peak flowering for herbal tea preparations (predominantly Scutellaria lateriflora / Mad Dog Skullcap).
Storage / Shelf Life: Dried leafy stems store in an airtight glass jar in a cool, dark place for 12–18 months.
Pruning: Cut back stems by one-third in late winter or early spring to shape the mound and remove winter dieback; shear lightly after the spring bloom flush to promote continuous summer flowering.