(Agastache nepetoides ‘Yellow Giant')
Giant Yellow Hyssop is a native perennial herb that can be commonly found growing on woodland edges, thickets, and in moist open woods throughout the Midwest and southwest United States. At maturity, this plant reaches the height of 5-6' and features square shaped stalks, arrowhead-shaped, 5” toothed leaves, and 5” terminal spikes that bare greenish=yellow flowers. This plant grows in a container, attracts bees, birds, and butterflies, repels cabbage moths, tolerates deer, drought and frost, is both edible and medicinal, self sows, and is great as a cut flower!
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General Information
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Germination
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Seedlings
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Harvesting
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Seed Saving
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Culinary
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Medicinal
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Companion Planting
Genus: Agastache
Species: nepetoides
Variety: Yellow Giant Hyssop
Native Range: Southern Canada to southeastern United States
Grown as: Perennial.
Maturity (Blooms): July to September
Hardiness: Hardy. Hyssop is very hardy and can withstand hard frost.
Crops: Spring Transplant
Growing Season: Short, Long
Growing Conditions: Cold, Cool, Warm. Hyssop prefers moderate water, but is drought tolerant once established.
Outdoor Growing Temp: 55°F - 85°F.
Min Outdoor Soil Temp: 60°F. There's no advantage to starting your seeds in cold soil, so wait until it's warmed up a little, to at least 60˚ F.
Start Indoors?: Yes.
Start Outdoors: No.
Light: Full Sun to Part Shade. Min. 6 hours daily (Cold, Cool, Warm). Hyssop prefers full sun, but can tolerate partial shade, as well.
Water: Dry to medium. Hyssop prefers moderate water, but is drought tolerant once established.
Feeder: Light. These plants grow best in rich soil, but almost any soil will do.
Suitability: Drought tolerant, Tolerates light frost, Tolerates hard frost.
Small Gardens?: Yes.
Attracts Beneficial Insects: Yes. Attracts many bees, hummingbirds, and butterflies
Containers?: Yes. Often grown in containers, massed in perennial borders, or trimmed to form a low hedge in sunny formal gardens, knot gardens or along walkways.
Maintenance: Low
Height: 60-72".
Spacing: 18-24”.
Sow Depth: On soil surface.
USDA Zone: 4a-9b.
Produces: square shaped stalks, arrowhead-shaped, 5” toothed leaves, and 5” terminal spikes that bare greenish=yellow flowers.
Garden Uses: A bold plant that masses well in the perennial border, native wildflower area, woodland or butterfly garden.
Seed Viability in Years: 2-4 years
Germination Percentage: 40%
Keep away from radishes.
Suggested Varieties
(Brassica oleracea 'Early Jersey Wakefield')
Early Jersey Wakefield Cabbage is a heirloom, hardy, cool weather annual vegetable that is native to England, but was first grown in the United States in 1840 by Francis Brill of Jersey City. At maturity, this plant reaches the height of 12-18” and features dark-green, conical heads averaging 5" in diameter and weighing 2 to 3 lbs. This plant can be grown in a container, attracts earwigs, is rabbits safe (in moderation), can be used as a trap crop for aphids, tolerates frost, and is edible.
(Brassica oleracea 'Late Flat Dutch')
Late Flat Dutch Cabbage is a heirloom, hardy, cool weather annual vegetable that is native to the Netherlands, but was first offered in the United States by D. M. Ferry & Company in 1924. At maturity, this plant reaches the height of 18-24” and features blue-green flat 12” heads that weigh up to 15 pounds. This plant can be grown in a container, attracts earwigs, is rabbit safe, can be used as a trap crop for aphids, tolerates frost, and is edible.
(Brassica oleracea 'Red Acre')
Red Acre Cabbage is a heirloom, hardy, cool weather annual vegetable that is native to southern Europe, but is commonly grown in the northern United States. At maturity, this plant reaches the height of 12-18” and features reddish purple round heads that weight up to 3 pounds. This plant can be grown in a container, attracts earwigs, is rabbit safe, can be used as a trap crop for aphids, tolerates frost, and is edible.
(Brassica rapa 'Pak Choi')
Pak Choi Chinese Cabbage is a heirloom, hardy, cool weather annual vegetable that is native to southern China, but has been commercially grown in the United States for more than 100 years. At maturity, this plant reaches the height of 6-18” and features a head of smooth, dark green leaves with thick white stalks. This plant can be grown in a container, attracts earwigs, is rabbit safe, can be used as a trap crop for aphids, tolerates frost, and is edible.