Hyssop
Hyssopus officinalis · Lamiaceae
📷 Robert Flogaus-Faust · CC BY 4.0
The gardener's calendar
Hyssop is in full bloom: enjoy it, watch watering in hot weather and let spent flowers feed pollinators before pruning.
ID card
- Foliage
- Evergreen to semi-evergreen
- Flowering
- July to September, blue-violet flowers
- Mature size
- 60 cm tall, 45 to 60 cm spread
- Growth
- Fast
- Hardiness
- Very hardy, down to -15°C
- Origin
- Mediterranean region and Central Asia
- Soil type
- Well-drained, chalky, poor to moderate
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Severe pruning in April (to 30-40cm) to densify annually: it regrows vigorously and flowers better. Prefer light, well-draining soil, avoid waterlogging.
The common mistake
Keeping the plant unpruned: it becomes bare at the base, leggy, and produces fewer flowers from year 3 onwards.
The pro's trick
Harvest flowers at the end of July just before full bloom for premium herbal tea (hyssop is lighter and more refined than mint).
Seasonal watch
September in humid climates: white powdery mildew on upper leaves.
Care
Exposure
Hyssop demands full sun for optimal growth and abundant flowering. It tolerates light partial shade but will flower less generously. Plant it in a warm, airy location to prevent fungal diseases.
Watering
Water regularly during the first year to establish roots. Once well established, hyssop is very economical with water and tolerates dry periods well. In pots, keep the soil slightly moist but never waterlogged.
Soil and planting
Hyssop prefers well-drained, light soil that is fairly chalky or neutral. It dislikes stagnant moisture and overly rich soils. Improve heavy soils with sand or gravel to ensure good drainage.
Pruning and maintenance
Cut the plant back by half in late winter to encourage a compact, bushy shape. Remove spent flowers as they fade to extend flowering. Cleaning of dead or damaged branches can be done in spring.
Fertilizing
Hyssop is undemanding and doesn't require regular fertilizing. A light application of compost or balanced fertilizer in spring is sufficient. In pots, a low-nitrogen fertilizer can support flowering during summer.
Diseases and pests
Hyssop is very robust. Powdery mildew may appear in humid or stagnant conditions; improve air circulation. Pests are rare. Avoid excess water which promotes root rot.
Did you know?
Hyssop is mentioned in the Bible and ancient texts as a plant of ritual purification. In the Middle Ages, it adorned monastic gardens for its reputed medicinal properties, and it remains used in the composition of certain traditional liqueurs and infusions for its subtle, slightly bitter aromas.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
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Tips generated and checked by Viridia — adapt them to your local climate.