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Description
Arachnis, commonly known as spider orchids, is a genus of orchids that belongs to the family Orchidaceae. This genus consists of about 20 species of epiphytic and lithophytic orchids, which are native to Southeast Asia, the Philippines, and Indonesia. The name Arachnis was derived from the Greek word “arachne,” which means spider, due to its spider-like appearance.
Taxonomic Information
| Domain | Eukarya |
|---|---|
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Liliopsida |
| Order | Asparagales |
| Family | Orchidaceae |
| Genus | Arachnis |
Appearance
Arachnis orchids have a unique and striking appearance that resembles spiders. Their long and narrow petals and sepals are striped with various colors, such as yellow, green, brown, red, and purple. The flowers have a prominent lip that is often decorated with spots or stripes. The inflorescence can reach up to 1 meter long and can bear up to 20 flowers.
Care Guide
Arachnis orchids require specific care to thrive and bloom successfully. Here are some care tips to keep in mind:- Water: Arachnis orchids prefer to be kept moist but not wet. Water them thoroughly once a week and allow the potting mix to dry out partially before watering again.- Fertilization: Feed Arachnis orchids with a balanced fertilizer every two weeks during the growing season. Reduce feeding during the winter months.- Soil: Arachnis orchids should be planted in a well-draining potting mix that contains bark, perlite, and sphagnum moss.- Sunlight: Arachnis orchids prefer bright, indirect light. Avoid direct sunlight, which can scorch the leaves.- Hardiness Zones: Arachnis orchids are tropical plants that require warm temperatures and high humidity. They can be grown indoors or in a greenhouse in hardiness zones 10-12.
Common Pests & Diseases
Arachnis orchids are susceptible to various pests and diseases, such as mealybugs, spider mites, scale insects, and fungal infections. Here are some common symptoms and treatments:- Mealybugs: These pests appear as white, cottony masses on the leaves and stems. Remove them manually and treat with insecticidal soap.- Spider mites: These pests cause yellowing and stippling on the leaves. Treat with insecticidal soap or neem oil.- Scale insects: These pests appear as small, brown, waxy bumps on the stems and leaves. Remove them manually and treat with horticultural oil.- Fungal infections: These diseases cause yellowing and wilting of the leaves. Treat with a fungicide and improve air circulation.
Habitat
Arachnis orchids are native to Southeast Asia, the Philippines, and Indonesia. They can be found growing as epiphytes or lithophytes in humid forests, on rocks, and on trees in tropical rainforests.
Question and Answer
Q: How often should I water my Arachnis orchid?
A: Water your Arachnis orchid once a week and allow the potting mix to dry out partially before watering again.
Q: What kind of soil should I use for my Arachnis orchid?
A: Arachnis orchids should be planted in a well-draining potting mix that contains bark, perlite, and sphagnum moss.
Q: What is the ideal temperature for growing Arachnis orchids?
A: Arachnis orchids require warm temperatures and high humidity. They can be grown indoors or in a greenhouse in hardiness zones 10-12.
Q: How do I prevent pests and diseases on my Arachnis orchid?
A: Regularly inspect your Arachnis orchid for pests and diseases. Maintain good air circulation and avoid overwatering.
Related Plants
– Vanda orchids- Cattleya orchids- Dendrobium orchids- Oncidium orchids
References
– “Arachnis.” OrchidWeb. https://www.orchidweb.com/arachnis- “Arachnis Orchids.” American Orchid Society. https://www.aos.org/orchids/culture-sheets/arachnis.aspx- “Spider Orchids: Care and Growing Guide.” Gardening Know How. https://www.gardeningknowhow.com/ornamental/flowers/orchids/spider-orchids.htm
