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How to Grow Hyssops UK | Regional Planting Calendar
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Harvest to Table sows indoors a week or so before the last frost, or direct-sows after the last frost; applied here as a spring sowing window.
Midlands - detail & sources
Harvest to Table sows indoors a week or so before the last frost, or direct-sows after the last frost; applied here as a spring sowing window.
Northern England - detail & sources
Same spring sowing window as elsewhere in the UK -- RHS rates hyssop H7 hardy below -20C throughout Europe, so no regional hardiness caution is needed here.
Scotland - detail & sources
Same spring sowing window as elsewhere in the UK -- RHS rates hyssop H7 hardy below -20C throughout Europe, so no regional hardiness caution is needed here.
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.
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).
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.
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.
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.
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
When should I sow hyssops in the UK?
In Southern England, from early March. In Scotland, wait until early March. Treat these as a guide rather than a fixed date — the governing rule is to sow only once frost risk has passed and temperatures are reliably warm enough.
When do I sow hyssops?
Sow early March to mid April, at around 18°C for germination.
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
Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.
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Every SoilCommander guide is written and maintained by our editorial team for real UK growing conditions, and reviewed against Royal Horticultural Society growing advice and Met Office climate data before publication.
Sketch your exact plot shape, pick your UK crops, and get a spacing-accurate bed layout with companion pairings, a rotation plan and month-by-month sowing dates — every fact sourced from RHS and Garden Organic.
