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Thalia dealbata
Powdery thalia
Thalia dealbata
Thalia dealbata, commonly known as Powdery Thalia, is an aquatic perennial plant native to the southeastern United States. It features large, lance-shaped leaves that are coated in a white, powdery substance, giving it a unique appearance. The plant produces tall stalks with clusters of small, purple flowers, adding visual interest to aquatic gardens. It thrives in shallow water or boggy conditions.
CategoryDetails
Plant TypePerennial plant
Estimated Plant Lifespan5 years lifespan
Sun Requirements4-6 hours direct sunlight (Partial Sun)
Pollination

Method: Animal

Notes: Pollinated by insects, particularly bees and other small pollinators.

Watering Requirements

Method: Submerged in water or in boggy soil

Frequency: Constantly moist

Notes: Prefers shallow water, ideally 6-12 inches deep or boggy soil. Ensure the soil or water source is consistently available.

Humidity Requirements

Level: High

Maintenance: Requires high humidity, maintain by keeping the plant in a pond, bog, or consistently moist environment.

Care InstructionsEnsure it has consistent access to water. Remove any dead or yellowing leaves to maintain the plant's appearance and health.
Temperature Range

Max: 35°C

Alternative NamesPowdery alligator-flag, Hardy canna, Thalia barbata
Iris pseudacorus
Yellow Iris
Iris pseudacorus
Yellow Iris shares similar growing conditions and adds contrasting color and texture with its sword-like leaves and yellow flowers.
Pontederia cordata
pickerelweed
Pontederia cordata
Pickerelweed is a native aquatic plant that enjoys similar conditions and provides beautiful blue flower spikes, complementing Thalia's foliage and flowers.
Typha latifolia
broadleaf cattail
Typha latifolia

Cattails are aggressive spreaders and can outcompete Thalia dealbata for space and resources, especially in smaller aquatic environments. They can quickly overtake the area.

Water Lily Aphid

These aphids feed on the plant's sap, causing yellowing and distortion of the leaves. They can be identified by their small, pear-shaped bodies, and their presence can weaken the plant. Infestations can lead to stunted growth and reduced flowering.

Steps:

    • Dig up a clump of Thalia dealbata in early spring or fall.
    • Gently separate the rhizomes, making sure each division has healthy roots and foliage.
    • Replant the divisions in a new location or container.
    • Water thoroughly after planting.
    • Take rhizome cuttings with at least one node.
    • Plant the rhizome cuttings in a suitable potting mix.
    • Keep the soil consistently moist.
    • Provide bright, indirect light.
    • Roots should develop in a few weeks, and new shoots will emerge.

Neem Oil

Effective natural insecticide and fungicide for aphids and other potential pests.

Aquatic Plant Fertilizer

Provides essential nutrients for healthy growth and flowering, especially in containers.