Olympic Quillwort Plant Care

Olympic Quillwort (Isoetes olympica) belongs to the Isoetaceae family within the Isoetes genus.

Olympic Quillwort displays a low rosette, compact growth habit, reaching up to 0.5 ft tall with a spread of approximately 0.5 ft. Olympic Quillwort produces small inconspicuous flowers.

Leaf size: approximately 6 inches.

Water a young or newly planted Olympic Quillwort every 7–14 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Olympic Quillwort thrives in full sun to partial shade.

Isoetes olympica tolerates temperatures of 60–80°F. Olympic Quillwort prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Sandy, acidic soil with good drainage. Good drainage is essential for Olympic Quillwort to prevent waterlogging, which leads to root rot and fungal issues.

Choose a spot with full sun to partial shade and sandy, acidic soil with good drainage. Avoid low spots where water collects after rain.

Olympic Quillwort is suited to USDA Zone 13a.

Plant container-grown or balled-and-burlapped shrubs in spring or early autumn, setting the root flare at soil level, and water well after planting.

Olympic Quillwort can spread to about 1 ft (0.2 m) and reach about 1 ft (0 m) tall. Space plants about 1 ft (0.2 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.

Planning a row or hedge? Try the plant spacing calculator.

Prune Olympic Quillwort while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.

If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the shrub in one year.

Olympic Quillwort is frost-tender (hardy to USDA zone 13). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Olympic Quillwort can be propagated through spores, division of rhizomes. Similar propagation techniques also apply to alpine quillwort plant care, which shares the same genus.

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Olympic Quillwort is susceptible to aphids, scale insects. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Olympic Quillwort grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. In cooler regions, grow Olympic Quillwort as a houseplant or bring it indoors before the first frost.