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Description
Helianthemum Violaceum, also known as purple rock rose or violet sunrose, is a perennial plant native to the western Mediterranean region. It belongs to the Cistaceae family and is a popular choice among gardeners due to its beautiful purple flowers that bloom in spring and summer. The plant typically grows up to 15-30 cm in height and has a spread of 30-60 cm.
Taxonomic Information
| Domain | Eukaryota |
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Malvales |
| Family | Cistaceae |
| Genus | Helianthemum |
Appearance
Helianthemum Violaceum has narrow, grey-green leaves that are about 2-3 cm long. The flowers are deep purple with a yellow center and appear in clusters at the end of the stems. Each flower is about 2-3 cm in diameter and has five petals. The plant blooms profusely in spring and summer, and deadheading can encourage more blooms. The foliage is evergreen, providing year-round interest in the garden.
Care Guide
Helianthemum Violaceum is a relatively low-maintenance plant that thrives in well-draining soil and full sunlight. Here are some tips for caring for this plant:
- Water: Water the plant deeply once a week, making sure the soil is moist but not waterlogged.
- Fertilization: Fertilize the plant in early spring with a balanced fertilizer.
- Soil: The plant prefers well-draining soil that is slightly alkaline. Amend the soil with compost or sand if it is heavy or clay-like.
- Sunlight: The plant requires full sunlight to thrive, so choose a spot that receives at least 6 hours of direct sunlight per day.
- Hardiness Zones: Helianthemum Violaceum is hardy in zones 7-9.
Common Pests & Diseases
Helianthemum Violaceum is generally resistant to pests and diseases, but it may be susceptible to the following:
- Aphids: These small, sap-sucking insects can cause distorted growth and yellowing leaves. Use insecticidal soap or neem oil to control them.
- Root rot: Overwatering or poorly-draining soil can lead to root rot, which can cause the plant to wilt and die. Make sure the soil is well-draining and do not water excessively.
- Powdery mildew: This fungal disease can cause a white, powdery coating on the leaves. Keep the plant well-ventilated and remove any infected leaves to prevent the spread of the disease.
Habitat
Helianthemum Violaceum is native to the western Mediterranean region, including Spain, Portugal, and Morocco. It grows in rocky or sandy soil in sunny, dry areas such as hillsides, cliffs, and meadows.
Question and Answer
Q: Can Helianthemum Violaceum grow in containers?
A: Yes, Helianthemum Violaceum can be grown in containers as long as the soil is well-draining and the plant receives full sunlight.
Q: How often should I fertilize Helianthemum Violaceum?
A: Fertilize the plant once a year in early spring with a balanced fertilizer.
Q: Is Helianthemum Violaceum deer-resistant?
A: Yes, Helianthemum Violaceum is deer-resistant.
Q: Can Helianthemum Violaceum tolerate drought?
A: Yes, Helianthemum Violaceum is drought-tolerant once established.
Related Plants
- Helianthemum nummularium (common rock rose)
- Helianthemum oelandicum (hoary rock rose)
- Helianthemum apenninum (white rock rose)
References
- “Helianthemum Violaceum.” Missouri Botanical Garden, www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c544.
- “Helianthemum Violaceum.” Royal Horticultural Society, www.rhs.org.uk/plants/100623/helianthemum-violaceum/details.
- “Purple Rockrose.” Gardenia, www.gardenia.net/plant-variety/helianthemum-violaceum-purple-rockrose.
