(Agastache nepetoides ‘Yellow Giant')

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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! 

  • General Information
  • Germination
  • Seedlings
  • Harvesting
  • Seed Saving
  • Culinary
  • Medicinal
  • Companion Planting
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​Family: Lamiaceae

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.
​Direct sow in the fall, to provide the required period of cool stratification naturally; the seed will sprout in the spring. For spring planting, mix the seed with moist sand and store it in the refrigerator for 60 days before planting on the surface of the soil. To starting the stratified seed indoors, plant on the surface of a flat with bottom heat of 70 degrees F and consistent moisture. Germination should take place within 6-10 days. As soon as the seedlings are big enough to handle and there is no chance of frost, they can be transplanted 18-24" apart. Hyssop prefers full or partial sun, and tolerates a wide variety of soils from dry to rather wet.
Keep young seedlings watered. Medium to moist soil is best for hyssop, but the plant is somewhat drought tolerant once it reaches maturity. Plants will bloom the second year from seed. It reseeds itself readily, so if volunteer plants are not wanted deadhead the faded flower spikes. This plant attracts bees, hummingbirds, and butterflies.
Fresh leaves can be individually harvested for tea, salads, or medicinal use throughout the growing season; in the morning after the dew has dried is the best time for harvesting. Take individual leaves first from the bottom of the stem and work up to the top. Do not remove more than 60% of the plant at any one time. To harvest entire stalks for drying, cut them 2-3” from the ground and hang them upside down to dry.
When the flower spikes begin to dry and turn brown, remove them and spread them out to dry; thresh them to remove the seed. Shaking the entire plant’s seed heads into a container is also effective, but the process should be repeated daily until all the seed has matured. Store the seed in a cool, dry place.

Seed Viability in Years: 2-4 years
Germination Percentage: 40%
Excellent tea herb.
Makes a Plant poultice good that is good for anti-inflammatory.
Project Purity Seeds can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Planted as a companion to cabbage (deters the cabbage moth) and grapes.

​Keep away from radishes.

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