Contents
Description
Helianthemum Nummularium, also known as Common Rockrose or Sunrose, is a small evergreen shrub that belongs to the Cistaceae family. This plant is native to Europe and has been widely cultivated for its ornamental value. It grows up to 30 cm tall and has a spread of about 50 cm. Helianthemum Nummularium produces small, bright yellow flowers that bloom in early summer and continue to appear sporadically throughout the season.
Taxonomic Information
| Domain | Eukarya |
|---|---|
| Kingdom | Plantae |
| Phylum | Spermatophyta |
| Class | Magnoliopsida |
| Order | Malvales |
| Family | Cistaceae |
| Genus | Helianthemum |
| Species | Nummularium |
Appearance
Helianthemum Nummularium has a dense, compact growth habit with small, dark green leaves that are about 1 cm long. The leaves are covered with fine hairs that give them a fuzzy texture. The flowers are about 2 cm in diameter and have five petals that are bright yellow in color. The center of the flower is adorned with a prominent cluster of golden stamens. As the flowers age, they turn darker in color and eventually drop off, leaving behind small, brown seed capsules.
Care Guide
To care for Helianthemum Nummularium, you need to provide it with adequate water, fertilization, soil, sunlight, and hardiness zones.Water: Helianthemum Nummularium prefers to be grown in well-draining soil that dries out between watering. Avoid overwatering as it can lead to root rot.Fertilization: The plant requires regular fertilization during the growing season, using a balanced fertilizer every two weeks.Soil: The plant prefers well-draining soil that is slightly acidic to neutral. It can tolerate poor soil conditions but will perform best in fertile, well-drained soil.Sunlight: Helianthemum Nummularium prefers full sun exposure and can tolerate partial shade. It requires at least 6 hours of direct sunlight per day to thrive.Hardiness Zones: The plant is hardy in USDA zones 5 to 9 and can withstand temperatures as low as -20°F.
Common Pests & Diseases
Helianthemum Nummularium is relatively pest and disease-free. However, it can be affected by spider mites, aphids, and mealybugs. These pests can be controlled using insecticidal soap or neem oil.
Habitat
Helianthemum Nummularium is native to Europe and can be found in rocky, dry habitats such as hillsides and cliffs. It has been widely cultivated for its ornamental value and can be grown in gardens, rock gardens, and containers.
Question and Answer
Q: How often should I water Helianthemum Nummularium?
A: Water the plant when the top inch of soil is dry to the touch.
Q: Can Helianthemum Nummularium tolerate frost?
A: Yes, the plant is hardy in USDA zones 5 to 9 and can withstand temperatures as low as -20°F.
Q: What is the best time to prune Helianthemum Nummularium?
A: Prune the plant in early spring before new growth appears to encourage bushier growth and more flowers.
Q: How tall does Helianthemum Nummularium grow?
A: Helianthemum Nummularium grows up to 30 cm tall and has a spread of about 50 cm.
Related Plants
- Helianthemum Canadense
- Helianthemum Cheilanthum
- Helianthemum Cinereum
- Helianthemum Dumosum
- Helianthemum Glomeratum
References
- “Helianthemum Nummularium.” Missouri Botanical Garden. Accessed August 23, 2021. https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=287839.
- “Helianthemum Nummularium.” Royal Horticultural Society. Accessed August 23, 2021. https://www.rhs.org.uk/Plants/16934/Helianthemum-nummularium/Details.
- “Helianthemum Nummularium.” The Spruce. Accessed August 23, 2021. https://www.thespruce.com/helianthemum-nummularium-plant-profile-5076012.
