Munro's globemallow
Sphaeralcea munroana · Malvaceae
📷 Walter Siegmund (talk) · CC BY-SA 4.0
The gardener's calendar
Ideal time to plant munro's globemallow: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Scientific name
- Sphaeralcea munroana
- Family
- Malvaceae
- Plant type
- Herbaceous perennial
- Foliage
- Deciduous
- Flowering
- June to August, orange-red flowers
- Mature height
- Approximately 90 cm
- Exposure
- Full sun
- Hardiness
- Moderate (zones 6-9)
- Water requirement
- Low, xerophytic plant
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Sphaeralcea thrives in very well-draining, even poor soils: if your soil is clay or humid, amend it with sand or pumice.
The common mistake
Most gardeners overwater it or plant it in rich, moist soil: it slowly rots and disappears without apparent reason in autumn.
The pro's trick
Cut it back hard in February–March and leave it without water from October to April.
Seasonal watch
Watch out in autumn: if rain comes early, it can be caught by moisture while wanting to go dormant.
Care
Exposure
This plant thrives in full sun and requires at least 6 hours of direct light daily. A south or west-facing exposure is ideal to encourage abundant flowering. In partial shade, the plant will become leggy and flower less generously.
Watering
Globemallow is very tolerant of drought once established. Water regularly during the first year to encourage root development, then space out watering. In summer, let the soil dry slightly between waterings. Avoid excess moisture at all costs, as it causes rot.
Soil
Well-draining and rather poor soil is preferable. The plant adapts to sandy, rocky, or mediocre soils, even chalky ones. Over-enriching the soil favors foliage at the expense of flowering. Adding sand or gravel will improve drainage if your soil retains too much moisture.
Fertilizer
Fertilizing is generally not necessary for this undemanding plant. A balanced fertilizer at low dose in spring may suffice. Avoid nitrogen-rich fertilizers that stimulate vegetation at the expense of flowers.
Pruning and maintenance
Cut the plant back to 15-20 cm above ground in late winter or early spring before growth resumes. Remove faded flowers during summer to encourage continuous blooming. At the end of the season, cut back the dry stems.
Diseases and pests
Globemallow is generally very resistant. Occasionally watch for spider mites in very dry and hot conditions. Powdery mildew can appear with excess moisture; in that case, improve air circulation and reduce watering. No special treatment is generally necessary.
Did you know?
Native to the semi-arid regions of the American Southwest, Sphaeralcea munroana was historically used by local populations for its traditional medicinal properties. Its name evokes its characteristic spherical fruits divided into capsules, hence the botanical term sphaeralcea literally meaning 'small round fruits'. It's an ideal pioneer plant for dry gardens and landscape design in water-restricted contexts.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Small-leaved limeTilia cordata
- Rose of SharonHibiscus syriacus
- Marsh mallowAlthaea officinalis
- Silver LimeTilia tomentosa
- Crimean lindenTilia euchlora
- Swamp hibiscusHibiscus moscheutos
Tips generated and checked by Viridia — adapt them to your local climate.