Yellow Giant Hyssop
Herbaceous perennial reaching 120-240 cm tall. Features coarse, toothed leaves and dense spikes of small, greenish-yellow flowers. Prefers rich, well-drained soils and partial shade to full sun. Attracts numerous pollinators, especially bumblebees. Suitable for back of borders and naturalized areas.
Plant Details
Bloom Colour: Greenish-Yellow
Bloom Time: Mid to Late-Summer
Sun Requirements: Sun to Part-Shade
Moisture: Moist-Drained
Phenology: Growth emerges from crown in late May. Leaves fully developed by mid-June. Flowering begins in July, continuing through September. Seed heads mature late September-October, persisting into winter. Dies back after hard frost.
Wildlife Value: Important late-season nectar source for bumblebees and other native bees; seeds eaten by small birds; deer resistant
Habit Over Time: Forms tall, robust clumps with strong architectural presence. Individual plants maintain clear boundaries and do not spread aggressively. The sturdy stems provide good vertical structure while allowing enough space between them for companion plants. Self-seeds modestly but not invasively.
Height: Tall (4-8 feet)