Brassia (Spider Orchid)
Brassia, often called the spider orchid, carries sprays of blooms with petals drawn out into 15-20 cm trailing threads, like elegant green-and-bronze spiders climbing the spike.
Last reviewed: October 2026
AI illustration Overview
Brassia, often called the spider orchid, carries sprays of blooms with petals drawn out into 15-20 cm trailing threads, like elegant green-and-bronze spiders climbing the spike. Add easy oncidium-style care and a spicy fragrance, and you get maximum exotica per unit of effort. (Brassia.)
Origin & Natural Habitat
Central/South American wet forests; pollinated (wonderfully) by spider-hunting wasps that attack the flowers.
Appearance
Oncidium-like pseudobulb plants 30-60 cm; long arching spikes of 8-15 spidery blooms (sepals stretched into streamers) green, gold, bronze, spotted; fragrant, 3-5 weeks, often twice yearly.
Why People Grow It - Qualities & Benefits
- The most theatrical bloom silhouette in easy orchids
- Spicy daytime fragrance
- Straightforward intermediate care
- Fast-growing into specimen sprays
Care
Light: Bright indirect + gentle sun (east window ideal) - standard 'oncidium light'.
Water: Thorough soak, approach dryness, repeat; slightly drier after bulbs finish.
Potting medium: Medium bark mix; roomy-ish pots for the vigorous roots.
Temperature & Humidity: 16-28°C ordinary home range; 50%+ humidity keeps streamer-tips from crisping.
Feeding: Half-strength every two weeks in growth.
Rest & rebloom: Mild post-growth rest triggers spikes; wrinkling bulbs during rest = one modest drink.
Propagation
Division (3+ bulbs); backbulbs sprout readily in moss - an easy multiplier.
Common Problems & Pests
- Streamer tips brown in dry air (cosmetic; humidity fixes)
- Standard scale/mealybug patrol
- Bloom skips = light or missed rest
- Little else: it's an easy genus wearing a wild costume
Toxicity & Safety
Not on the ASPCA lists. The ASPCA Animal Poison Control Center's plant lists for cats and dogs have no entry for this plant, and we have no other checked source either way. If a pet chews it and seems unwell, call your vet or a pet poison helpline.
Pros & Cons
Pros
- Jaw-dropping spider sprays
- Easy-intermediate care
- Frequent blooming, quick growth
Cons
- Blooms weeks not months
- Big specimen plants sprawl
- Subtle colors (drama is in FORM)
Best Suited For
- Growers bored of round flowers
- East-window sills
- Fragrance-and-form collectors
- Halloween-adjacent decor, honestly
FAQ
Why 'spider' orchid?
The drawn-out threadlike sepals mimic spiders convincingly enough that female spider-wasps sting the lip trying to hunt them - performing pollination in the struggle. Evolution wrote the horror script.
How do I get rebloom?
Standard oncidium recipe: good light, finish the pseudobulb, slight dry-cooler pause - spikes rise from the new bulb's base sheaths.
Gear for growing brassia (spider orchid)
Links go to Amazon or a partner store (such as Adagio Teas) and may earn us a commission at no extra cost to you. As an Amazon Associate we earn from qualifying purchases. We link gear types, not sponsors' picks: you choose the exact product.