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White Horehound

Herb
70 days to harvest
Full sun

What's special about White Horehound

The classic silvery-leaved medicinal herb of cough syrups and old-time candy.

Growing this variety

White Horehound follows the same growing basics as Horehound. Variety-specific maturity above; everything else below applies to the whole Horehound family.

Season
Cool to warm season — hardy perennial
USDA zones
Perennial 3–10
Sun
Full sun
Start indoors
8–10 weeks before last frost
Direct sow outdoors
After last frost
Days to harvest
70 days

Germination

Germination time
14–21 days
Soil temperature
60–70°F

Spacing & depth

Sow depth
Surface press
Seed spacing
12 in
Mature plant spacing
18–24 in
Row spacing
24 in

How to plant

Surface-sow — needs light. Transplant to lean, well-drained, sunny soil. Fuzzy grey-green leaves on 24-in plants; whorls of tiny white flowers up the stems in year 2. Cut for tea and candy-making anytime.

Grower's tip

The traditional cough-drop and beer-flavoring herb. Bitter — brew short. One plant is usually plenty; reseeds where happy.

Soil preferences

Soil type

Light, well-drained loam. Most culinary herbs suffer in soggy soil.

pH range

6.0–7.5 (neutral)

Amendments

A single fork of finished compost at planting is plenty — over-feeding weakens flavor.

Watering

Frequency

Consistent moisture while young; let the top inch dry between waterings once established.

Method

Water at the base in the morning to keep leaves dry and prevent mildew.

Over vs. under

Overwatered: yellow lower leaves, damp-smelling soil, wilt that doesn't rebound. Underwatered: crispy tips, purple stems, sudden bolting.

Top-water or bottom-water?

Prefers top-watering — Top-water at the base — these Mediterranean herbs hate wet foliage and rot with soggy crowns. Let the soil dry between waterings.

Temperature tolerance

Ideal daytime air temp

65–85°F (18–29°C) ideal

Ideal nighttime air temp

55–65°F (13–18°C)

Frost sensitivity

Most annual herbs are frost-tender; perennial herbs (sage, thyme, oregano, mint) tolerate frost once established.

Container growing

Container-suitable?

Yes — great in containers

Recommended pot size

6–10 in (15–25 cm) wide, minimum 6 in deep

Notes

Herbs thrive in pots — group by water needs (Mediterranean herbs on the drier side, basil/parsley/cilantro on the wetter).

Succession planting

Sow leafy herbs (basil, cilantro, dill, parsley) every 3–4 weeks for a steady supply.

Detailed harvesting

Pinch or snip stems just above a leaf pair — never strip a plant of more than one third at a time. Harvest before flowering for peak flavor.

Post-harvest storage & preservation

Air-dry small bundles upside-down in a dark airy spot, or freeze chopped in olive oil in ice-cube trays. Store dried leaves whole in a jar; crush just before use.

Culinary, medicinal & other uses

Culinary flavoring — fresh in salads and finishing, dried in slow cooks and rubs. Many herbs (basil, mint, chamomile) also infuse oils, vinegars, or teas.

Medicinal or traditional uses are shared for interest only — this is not medical advice. Consult a qualified professional before using any plant medicinally.

Seed saving

Pollination

Mostly insect-pollinated; some (basil, mint) self-pollinate.

Isolation needs

Isolate different varieties of the same species by 150 ft or cage/bag flower heads to keep strains true.

How to save

Let one plant flower fully; harvest brown, dry seed heads into a paper bag; rub free and store dry.

Your zone's planting calendar

Pick your USDA hardiness zone and we'll estimate the key dates for horehound in your area. These are regional averages — always check your own last-frost forecast before sowing.

My White Horehound Horehound notes

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White Horehound Horehound seeds on hand

Track packets and loose seeds you already have. Private to your account.

Par level — leave at 0 for no alert. Anything below par shows on Seed Starting and your shopping list.

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From your kitchen — grow horehound from what you already have

Most annual and biennial herbs give seed if you stop harvesting one plant and let it flower.

  1. 1Choose your best-flavored, latest-to-bolt plant to be the seed parent.
  2. 2Let it flower, then wait for the seed heads to dry brown and papery on the plant.
  3. 3Cut whole stems into a paper bag before they shatter.
  4. 4Rub or crumble the heads to release seed; sieve out the chaff and store dry in an envelope.

Storage: Most herb seed stays viable 2–4 years dry.

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