Agastache (Hyssop)

Terra Nove Nurseries ‘Blue Boa’

Scientific Name: Agastache

Height: 2 to 4 ft

Width: 2 to 3 ft

Spacing: 12 to 15 in

Sun: Grows best in Full Sun, but will tolerate partial sun

Bloom Time: Early summer thru Fall

Water: When first 2-3 inches are dry (Summertime, 85+, requires 2x daily watering)

Soil Type: Rich, loose, moist soil

Soil pH: 6.0 to 7.5

Zones: 4 to 10

Uses/Styles: Middle-ground planting, edging of woodlands

Flower Colors: Purple to lavender, pink, rose, blue, white, and orange

Attracts: Pollinators; butterflies, hummingbirds, bumblebees, honey bees, moths

Special Features: Deer repellant, medical uses, pollinator attractor!

Agastache’s come from all over the world. Many are native to North America while many are from Asia. With more than 30 species, there are countless uses both medicinally and in the garden. Most of the zones within North America allow for Agastaches to become perennials but in the regions where it gets below 10F consecutively, they become annuals. They are fairly hardy and can tolerate drought conditions as long as the plant has had a year or two to become fully established.

Many are dealing with a growing population of deer in their neighborhoods, which means damage to your plants. Using deer repellant plants, including Agastache, can help with their nibbling. Deer do not like strong scents like mint, lavender, bee balm, catmint, and others. Line your beds with strongly scented plants and it will help prevent damage from them and other pesky critters.

If you are new to Agastache and have never planted one, don’t fret. Make sure you have a sunny location where the soil isn’t dense like clay. Clay soil will hinder the root growth and may eventually kill off your plant. To loosen up clay soil, add in either some loamy or sandy soil until the consistency is loose and airy. You want to make sure air can still flow through the soil because oxygen is also an important factor in healthy roots. When the soil is loose and airy, make sure the hole is 4 inches wider and deeper than the root ball of the plant. Add Biotone into the mixture; make sure to read the instructions! With one hand, hold the plant in place as you scoop the soil mixture around the root ball. Once the soil is to the top, give it a gentle pat down and water immediately.

Now that you have made an attachment to this plant, make sure to care for it. That includes checking it for diseases and pests. Depending on the weather and planting conditions, you may, or may not, have the appearance of:

  • Aphids
  • Mites
  • And Thrips

Using insecticidal soaps can help greatly. It will usually take several different applications for it to kill off everything but you can also use Neem Oil in conjunction with the soap. It’ll help kill off the reproductive systems of the adults. Do make sure to isolate all of the plants that have been infected until the pests have been fully eradicated.

With pests come diseases. Look out for:

  • Botrytis Blight
  • Powdery Mildew
  • Leaf Spot
  • Rust
  • and Downy Mildew

With Botrytis Blight and Leaf Spot, use Neem Oil. Powdery and Downy Mildew, use a fungicide spray that targets mildew as it occurs due to lack of air circulation and hot and humid conditions. Rust can be treated with Copper sprays or sulfur powders; make sure to read the instructions! Make sure when you are watering to get water at the base of the plant. When water lands on the leaves and the sun dries it, it eventually will burn the leave and allow for diseases and fungi into the pores of the leaves.

Agastache grows well with many different plants:

  • Coneflowers
  • Russian Sage
  • Lavender
  • Rosemary
  • Rudbeckia
  • and blue tinged grasses like Blue Eijah or Blue Oats.

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