June 2019 – Native Plant of the Month
Written by Guest Contributor: Elenore Goode
Scutellaria ovata/Heartleaf Skullcap and its subspecies
The delicate blue flowers of Heartleaf Skullcap provide a refreshing sight in late spring and into summer. Their bloom time compliments well in the landscape with other wildflowers that stop blooming sooner, and this overlap helps to provide food for pollinators throughout the summer. When happy, these reliable perennial herbs spread quickly into large stands through their rhizomes, like many other species in the mint family. They are easy to propagate by digging and replanting the roots, and though they can spread into large clumps, they are not particularly aggressive when growing with other plants. Heartleaf Skullcap is one of various Scutellari species that grow in Texas, and prefers slightly more moisture, soil, and shade than the average hill country plant to truly thrive.
Yet, they are still very hardy and can survive a drought even in poor/shallow soil once established, though their growth will be reduced in those conditions. In deeper soils, Heartleaf Skullcap can more easily thrive in full sun, and it often prefers well-draining soils over heavy clays.
This wonderful woodland edge plant follows a cool season life cycle, and in fall it will begin growing out many different stalks from its roots, which then maintain themselves as a low groundcover over the winter. This growing habit is very useful to incorporate with warm season plants that go dormant in the winter, so that both groundcover and photosynthesis/feeding of soil microbes can be maintained over the winter.
Heartleaf Skullcap starts to grow its stalks out in early spring, reaching anywhere from 1-3 feet in height before they bloom, depending on their growing conditions. Depending on latitude, light, and moisture conditions, they usually begin to bloom anywhere from April to May, continuing into summer, and will continue blooming longer with wetter conditions. Heartleaf Skullcap loves the cool weather, and typically goes dormant as the summer heat settles in, unless prolonged by cooler weather and periodic rains, or if growing in a cooler and moist microclimate.
Scutellaria ovata is becoming more common in nurseries thanks to its various beneficial qualities and growing habits. The beautiful silvery-blue-green, fuzzy foliage and soft blue blooms create a pleasant visual contrast in the landscape. Like many other Scutellaria species, Heartleaf Skullcap also possesses useful medicinal compounds, and can be used similarly to Scutellaria lateriflora, though they have their differences.