Yellow giant hyssop (Agastache nepetoides) is a tall and fast-growing perennial. It's a member of the mint family but unlike other members of the family it’s not very aromatic. It is deer-resistant however as deer find its leaves bitter-tasting and leave it alone. This species blooms green-yellow flowers from summer into early fall attracting pollinators.
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Perennial
Lifespan
Herb, Shrub
Plant Type
Summer, Fall
Bloom Time
1.2 m to 1.8 m
Plant Height
90 cm
Spread
Green
Leaf Color
6 mm
Flower Size
Yellow, Green, White
Flower Color
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Images
Care Guide
Common Diseases
Images of Yellow giant hyssop
Care Guide for Yellow giant hyssop
Every week
Water
Full sun
Sunlight
5 - 35 ℃
Ideal Temperature
Garden Soil
Soil Type
Water:
Yellow giant hyssop originates from temperate regions and prefers moderate moisture levels, thriving with consistent hydration. Weekly watering is ideal, along with well-draining soil that retains moisture. Typically found in gardens, yellow giant hyssop benefits from natural rainfall, enhancing its foliage during the growing season.
Fertilize:
To promote optimal growth for yellow giant hyssop, use a balanced fertilizer in spring, switching to a high phosphorus formula pre-bloom. Apply monthly during the growing season and ensure to water yellow giant hyssop before and after fertilization. Always wear gloves for safety and follow package instructions closely.
Pruning:
Yellow giant hyssop features tall spikes and yellow flowers, thriving with early spring to late spring pruning. Key techniques involve removing dead stems and cutting back one-third for bushier growth, enhancing air circulation and bloom production while reducing disease risk for robust plants.
Propagation:
Yellow giant hyssop thrives in well-draining soil and prefers full to partial sun. Surface-sow seeds for germination, keeping them moist. Once seedlings develop true leaves, transplant them to allow for mature growth spacing.
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