Aaron's rod (Thermopsis villosa)

Aaron's rod

Thermopsis villosa, or Aaron's rod, is an herbaceous plant in the legume family. Its native range is in North America, in the southern Appalachian mountains. It is found elsewhere as an escape from cultivation.

Scientific classification

Species

Aaron's rod (Thermopsis villosa)

Legumes, milkworts and allies

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Perennial

Lifespan

Herb

Plant Type

Spring, Summer

Bloom Time

61 cm to 1.5 m

Plant Height

60 cm to 90 cm

Spread

Green, Blue, Gray, Silver

Leaf Color

2.5 cm to 8 cm

Flower Size

Brown, Green, Copper

Fruit Color

Yellow

Flower Color

Green

Stem Color

Images of Aaron's rod

Quickly Identify Aaron's rod

Tall spikes with bright yellow pea-like flowers.

Compound leaves with velvety, hairy leaflets.

Elongated seed pods covered in dense, shaggy hairs.

Trifoliate leaves with gray-green color and large stipules.

Profuse blooming of clustered flowers in vivid hues.

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Care Guide for Aaron's rod

Every 1-2 weeks

Water

Full sun

Sunlight

5 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Aaron's rod thrives in temperate habitats, preferring moderate moisture and drought resistance. Watering every 1-2 weeks maintains its health. In gardens, aaron's rod benefits from seasonal rainfall, ensuring adequate hydration without risk of over-saturation.

Fertilize: Fertilize aaron's rod with a balanced 10-10-10 mix quarterly during growing seasons, applying 1 tablespoon per square foot. Avoid winter fertilization to prevent over-fertilization. Always water thoroughly post-application and consider seasonal adjustments for aaron's rod's needs. Gloves are recommended for novice gardeners.

Pruning: Aaron's rod boasts dense foliage and tall yellow flower spikes. For best results, prune in early to late spring and remove damaged stems to promote growth. Thinning improves air circulation, reduces disease risk, and enhances the plant's aesthetics and vigor, making it a garden focal point.

Propagation: Aaron's rod can be propagated by division, separating established clumps into smaller segments. Ensure roots are developed before division, using a sharp, sterilized tool. Afterward, plant in well-draining soil and maintain consistent moisture to support growth, avoiding waterlogging.

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