Lupinus texensis

42.14725113, -87.78881073

Texas Bluebonnet

Lupinus texensis, or Texas bluebonnet, carpets parts of the Southwest in early spring if rains have been sufficient to keep the seedlings alive over the winter. Bluebonnets germinate in the fall and overwinter as a pair of cotyledons (seed leaves). The seeds are very long-lived in the soil seed bank. The very thick seed coats are diminished by fire, resulting in a large number of bluebonnets appearing after wildfires.

The genus name is derived from the Latin lupus(wolf), referring to the mistaken belief that as plants spread into an area, they depleted the soil nutrients. In fact, this plant and many other members of the pea family (Fabaceae) have a symbiotic relationship with nitrogen-fixing bacteria, and they leave the soil richer when they die. The leaves and flowers of bluebonnets are a favorite food for wildlife and livestock.

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Soil:
Moderate
Plant Shape:
Upright
Exposure:
Full Sun
Bloom Time:
May - June
Bloom Color:
White
Blue
Landscape Use:
Bedding or Border
Wildlife Interest:
Attracts Birds
Attracts Butterflies
Plant Type:
ANN
Hardiness Zone:
7 - 8