Houseplant
Calathea (Rattlesnake Plant)
Goeppertia insignis · Marantaceae
Also called: Rattlesnake Plant, Calathea lancifolia, Prayer Plant (loosely)
Calathea (Rattlesnake Plant) (Goeppertia insignis) is a moderate-water houseplant well suited to Tucson and the low desert. It thrives in bright indirect light only, with a moderate growth rate.
Calathea (Rattlesnake Plant) at a glance
- Water use
- Moderate (established)
- Sun
- Bright indirect light only; no direct desert sun, which scorches and fades the foliage. An east window or a few feet back from a bright south/west window works well indoors.
- Mature size
- About 18-30 in. tall and wide indoors.
- Growth rate
- Moderate
- Bloom
- Insignificant; grown for foliage. Rarely flowers indoors., Rarely blooms indoors
- Cold hardiness
- Frost-tender tropical; keep above 60-65°F. Avoid cold drafts, AC vents, and temps below 55°F. Grown strictly indoors in Tucson.
- Soil
- Light, well-draining, peat- or coir-based potting mix that retains some moisture; add perlite for aeration. Slightly acidic.
- Native range
- Brazil (tropical rainforest understory)
- Best used as
- Indoor foliage accent, Low-light decorative houseplant, Tabletop or shelf plant
- Wildlife
- None (indoor plant).
- Toxicity
- Non-toxic to cats, dogs, and humans (pet- and child-safe per ASPCA).
How to grow Calathea (Rattlesnake Plant) in Tucson & the low desert
Watering
Keep the soil lightly and evenly moist, never soggy and never bone-dry; water when the top inch dries. In Tucson's dry indoor air use distilled, rainwater, or filtered water, as the high salt/mineral content of local tap water causes leaf-edge browning.
Fertilizer & nutrients
Feed monthly spring through summer with a balanced houseplant fertilizer (e.g., 10-10-10 or 20-20-20) diluted to half strength; stop in winter. It is sensitive to fertilizer salt buildup, so flush the pot periodically.
Pruning & care
Minimal; simply snip off yellowed, browned, or damaged leaves at the base with clean shears to keep the plant tidy.
Notes
Grown exclusively as a houseplant in Tucson; the low-desert climate (intense sun, single-digit humidity, hot summers, mild frost) is far too harsh outdoors. It is a humidity lover, so Tucson's very dry indoor air is the main challenge: group with other plants, use a pebble tray or humidifier, and keep away from heating/cooling vents. Leaves fold up at night ('prayer' movement). Sensitive to tap-water salts and chlorine.
Sources: University of Arizona Cooperative Extension; ASPCA Toxic and Non-Toxic Plant List; Missouri Botanical Garden Plant Finder