Olive-leaved gromwell is a low-growing evergreen sub-shrub from the rocky alpine areas of the Eastern Pyrenees that brings sky-blue trumpet flowers to sun-baked garden spaces where most perennials struggle. Hardy in zones 6 through 8, this prostrate spreader typically reaches just 6 to 9 inches tall but expands to 12 inches wide, making it invaluable for rock gardens, alpine troughs, and naturalized settings. From June through July, it produces showy clusters of delicate 5-lobed flowers that seem impossibly bright against its fine, dark olive-green foliage, which remains attractive year-round.
Full Sun
Moderate
6-8
9in H x 12in W
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Moderate
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The real appeal lies in the plant's ability to thrive in alkaline, well-drained soils where heat and aridity would defeat ordinary perennials. Its silky-white undersides to narrow leaves catch the light as you brush past, while the electric sky-blue flowers arrive in dense whorls just when early summer heat sets in. This evergreen sub-shrub asks little in return: no significant pest or disease problems plague it, and once established in the right spot, it essentially runs on its own.
Olive-leaved gromwell is grown primarily for naturalized plantings in rock gardens, alpine troughs, and other settings where its low, spreading habit and early summer flowers can be showcased. Its prostrate, suckering growth makes it especially valuable for clothing difficult, sunny, well-drained slopes where conventional perennials fail.
No timeline data available yet for this variety.
Propagate by removal of suckers in spring, either as individual rooted segments or as divisions from established clumps. Transplant these rooted pieces into their permanent positions once soil is workable in spring, spacing them 6 to 12 inches apart to allow room for their mature spread.
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“Lithodora oleifolia is native to a few rocky alpine areas in the Eastern Pyrenees, a narrow endemic range that speaks to its preference for cool, high-altitude conditions and alkaline limestone soils. The plant was collected and cultivated from these wild populations, eventually finding its way into European alpine and rock gardens where its dwarf stature and reliable hardiness made it a treasured specialty.”