Mejia's Dioon Plant Care

Mejia's Dioon (Dioon mejiae) belongs to the Zamiaceae family within the Dioon genus. Mejia's Dioon is native to Honduras. Mejia's Dioon is also known as Majestic Dioon.

Mejia's Dioon displays a slow-growing cycad growth habit, reaching up to 6 ft tall with a spread of approximately 4 ft. Mejia's Dioon produces cones rather than typical flowers.

Leaf size: approximately 24 inches.

Water a young or newly planted Mejia's Dioon every 14–21 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established trees mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Mejia's Dioon thrives in bright indirect to partial shade. Avoid placing Mejia's Dioon in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Dioon mejiae tolerates temperatures of 50–80°F. Mejia's Dioon prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining, sandy soil mix with added organic matter like peat moss or compost. Good drainage is essential for Mejia's Dioon to prevent waterlogging, which leads to root rot and fungal issues.

Feed Mejia's Dioon every 8 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees in good soil often need little extra feeding, so let weak growth or pale foliage guide you.

Stop feeding by late summer so new growth can harden before winter.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Choose a spot with bright indirect to partial shade and well-draining, sandy soil mix with added organic matter like peat moss or compost. Avoid low spots where water collects after rain.

Mejia's Dioon is suited to USDA Zone 12a – 11b.

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

Mejia's Dioon can spread to about 4 ft (1.2 m) and reach about 6 ft (2 m) tall. Space plants about 4 ft (1.2 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 tree spacing calculator.

Prune Mejia's Dioon 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 tree in one year.

Mejia's Dioon is frost-tender (hardy to USDA zone 12). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Mejia's Dioon can be propagated through seeds, division of offsets. Similar propagation techniques also apply to mexican cycad plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

Mejia's Dioon is susceptible to scale insects, mealybugs, spider mites. 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.

Mejia's Dioon grows outdoors in USDA Zone 12a – 11b. It survives winters down to planting zone 12a. Mejia's Dioon is native to Honduras. In cooler regions, grow Mejia's Dioon as a houseplant or bring it indoors before the first frost.