Spider Orchid - Arachnis flos-aeris

Spider Orchid (Arachnis flos-aeris)

The Spider Orchid is an exotic tropical orchid known for its unusual spider-like blooms and striking appearance. Botanically classified as Arachnis flos-aeris, this orchid produces dramatic flowers with long, narrow petals that resemble spider legs. Many plant enthusiasts choose to buy Spider Orchid plants online because they add a unique, conversation-starting feature to indoor plant collections, patios, and tropical gardens.

Landscaping Uses

Spider Orchids are popular as indoor statement plants and in tropical greenhouse collections. Their tall, upright growth habit and dramatic flowers make them ideal focal plants for bright indoor spaces, sunrooms, and orchid displays. In warm climates, they can also be grown outdoors in sheltered patios or tropical gardens where humidity levels are higher.

Specifications

Height: Up to 7 ft with support
Width: Around 2 ft
Growth Rate: Slow
Sun: Bright Indirect Light or Partial Shade
Water: Light to Moderate; allow medium to dry slightly between watering
Soil: Well-draining orchid potting mix
Bloom Season: Fall through Winter
USDA Zones: 9–11 outdoors, 3–11 patio or indoor

Why Homeowners Love It

• Exotic spider-shaped blooms in vibrant colors
• Unique orchid that becomes a conversation piece
• Perfect for indoor growing and tropical plant collections
• Tall vertical growth creates a dramatic display

Planting & Care

Plant Spider Orchids in a well-draining orchid potting mix and place them in a location with bright, indirect sunlight. These orchids prefer warm temperatures and moderate to high humidity. Water sparingly, allowing the growing medium to dry slightly between watering to prevent root rot. Feed every two to four weeks during the growing season using a diluted orchid fertilizer to support healthy growth and flowering. Remove spent flower spikes by pruning them back to the base to encourage new growth and future blooms.