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How to Grow Hyssops | Planting & Establishment

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Hyssop (Hyssopus officinalis)

A bee pollinating hyssop flowers — “Bumblebee on hyssop in Sweden” by Inhemska trädgården is licensed under CC BY-SA 4.0. Source: Wikimedia Commons

2 sources cited · Verified

The short answer

Site
6+ hours of sun, soil pH 7–8
Biggest risk
Foot and root rot

Hyssops (Hyssopus officinalis) — Herbaceous perennial or evergreen sub-shrub with linear, aromatic leaves and spikes of tubular, 2-lipped flowers.

Unlike an annual crop, the work here is front-loaded into establishment: get the planting and the site right and the same plants crop for several seasons.

Core growing advice on this page is checked against named horticultural sources — see References.

Soil & Growing Conditions

A field of flowering hyssop — “Hyssopus officinalis Hyzop lekarski 2019-07-18 04” by Agnieszka Kwiecień, Nova is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Hyssopus officinalis Hyzop lekarski 2019-07-18 04” by Agnieszka Kwiecień, Nova is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Soil pH range

7 8

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Growth Stages

Close-up of narrow aromatic hyssop leaves — “Hyssopus officinalis Hyzop lekarski 2019-05-17 04” by Agnieszka Kwiecień, Nova is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Hyssopus officinalis Hyzop lekarski 2019-05-17 04” by Agnieszka Kwiecień, Nova is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.
Stage BBCH Notes
Sowing 0 Harvest to Table: sow 1/4in deep, germinating in about 14 days; sow indoors a week or so before the last frost, or direct-sow after the last frost or in autumn. RHS: propagate by seed or softwood cuttings in summer, or sow in containers in a cold frame in autumn.
Planting and establishment 0 Full sun, well-drained soil (RHS; Harvest to Table); space 12-18in apart (Harvest to Table). Tolerates dry conditions well once established but dislikes wet soil.
Pruning 3 RHS: pruning group 10, in mid-spring. Harvest to Table: pruning after flowering is essential to prevent legginess and encourage bushier growth with repeat bloom.
Flowering and harvest 6 Attracts bees, butterflies and hummingbirds -- beekeepers value the resulting honey (Harvest to Table). Harvest leaves as needed before flowering; pick flowers when three-quarters open, in the morning, for the strongest oils; cut whole branches for drying (Harvest to Table).

Quick Facts

A hyssop flower spike — “Hyssopus officinalis RF” by Robert Flogaus-Faust is licensed under CC BY 4.0. Source: Wikimedia Commons
“Hyssopus officinalis RF” by Robert Flogaus-Faust is licensed under CC BY 4.0. Source: Wikimedia Commons.
Factor Value
Soil pH 7 - 8
Sunlight 6-8 hours direct sun
Germination temp 18C
Minimum survivable temp -20C
Drainage Fertile, well-drained, tolerates chalk and loam (RHS). Harvest to Table: compost-rich, well-drained; dislikes soggy soil.
Lifecycle Herbaceous perennial or evergreen sub-shrub with linear, aromatic leaves and spikes of tubular, 2-lipped flowers. RHS rates it H7, hardy below -20C throughout Europe; Harvest to Table gives an even wider US zone range (3-11), cold hardy to -35F.
Edible parts leaves, flowers

At a Glance

A pink-flowered hyssop variant — “Hyssopus officinalis 002” by H. Zell is licensed under CC BY-SA 3.0. Source: Wikimedia Commons
“Hyssopus officinalis 002” by H. Zell is licensed under CC BY-SA 3.0. Source: Wikimedia Commons.
Hyssopus officinalis Hyssop Foot and root rot (gene… Leafhoppers Root-knot nematodes Scale insects DISEASES PESTS

Harvest & Storage

Close-up of a hyssop flower spike — “Hyssopus officinalis 004” by H. Zell is licensed under CC BY-SA 3.0. Source: Wikimedia Commons
“Hyssopus officinalis 004” by H. Zell is licensed under CC BY-SA 3.0. Source: Wikimedia Commons.

When to pick: Harvest to Table: pick leaves as needed before the plant flowers; harvest flowers when the blooms are three-quarters open, in the morning for the strongest oils.

Storage

Harvest to Table: cut whole branches for drying leaves or flowers.

Diseases

Close-up of purple hyssop flowers — “Hyssopus officinalis 005” by H. Zell is licensed under CC BY-SA 3.0. Source: Wikimedia Commons
“Hyssopus officinalis 005” by H. Zell is licensed under CC BY-SA 3.0. Source: Wikimedia Commons.
Foot and root rot (general)
moderate

Named directly by Harvest to Table: root rot in soggy soil, the main disease risk for this crop. RHS reports the plant generally disease-free in the UK -- a real difference in emphasis kept honest.

Pests

A bee pollinating hyssop flowers — “Bumblebee on hyssop in Sweden” by Inhemska trädgården is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Bumblebee on hyssop in Sweden” by Inhemska trädgården is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.
Leafhoppers
low

Cicadellidae (various spp.)

Named directly by RHS.

Root-knot nematodes
low

Meloidogyne spp.

Harvest to Table names "nematodes" without a specific species -- recorded against the existing root-knot nematode entry.

Scale insects
low

Diaspididae / Coccidae

Named directly by Harvest to Table ("scale"); can be picked off and crushed.

References

  1. Hardiness: zones 3-11, cold hardy to -35F. Site/soil: full sun, tolerates partial shade; compost-rich, well-drained soil; pH 7.0-8.0, slightly alkaline. Spacing: 12-18in apart. Sowing: indoors a week or so before last frost, or direct-sown after last frost or in autumn; 1/4in deep, germinates in about 14 days. Harvest: leaves as needed before flowering; pick flowers when blooms are three-quarters open, in the morning; cut whole branches for drying leaves or flowers. Pests: scale (picked off and crushed) and nematodes can occur. Diseases: susceptible to root rot in soggy soil -- ensure well-drained soil. Propagation: readily self-sows from seed; 6in stem cuttings with rooting hormone; 4-6in root divisions in spring or fall.

  2. Soil: fertile, well-drained, alkaline to neutral; tolerates chalk and loam; moist but well-drained or well-drained. Sun/aspect: full sun or partial shade, south/west-facing. pH: alkaline or neutral. Hardiness H7 (below -20C, hardy throughout Europe). Size: 0.1-0.5m height, 0.5-1m spread, 5-10 years to maturity. Exposure: exposed or sheltered. Propagation: seed or softwood cuttings in summer; sow seed in containers in a cold frame in autumn. Pruning group 10, mid-spring. Pests: may be susceptible to leafhoppers. Diseases: generally disease-free.

2 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.

Frequently Asked Questions

What soil pH do hyssops need?

A pH of about 7–8. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.

What problems affect hyssops?

Our data links 1 disease and 3 pests to this crop. See the sections above for each one and how to manage it.

Plan next season before the problems start

This page gives you the thresholds; the planner turns them into your own calendar. It works from what you can observe and measure in your garden rather than from dates written for somebody else’s latitude.

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SoilCommander Editorial Team

Science-based growing guides · Thresholds that hold in any climate

This guide states the conditions the plant itself responds to — soil temperature, frost tolerance, day length — rather than dates, because the same calendar month means opposite seasons in the northern and southern hemispheres. Anything genuinely restricted to one part of the world is named as such rather than presented as universal. Written and maintained by our editorial team against international horticultural research and extension sources.

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Last verified 2026-09-04

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