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Repotting guide

When & how to repot Hyssop (Hyssopus officinalis)

Also called hyssop, common hyssop, garden hyssop.

More about hyssop

About Hyssop

Hyssopus officinalis · also called hyssop, common hyssop · herb

Hyssop is a hardy, semi-evergreen Mediterranean sub-shrub in the mint family, grown for its narrow aromatic leaves and spikes of deep blue-purple summer flowers that draw bees and butterflies. It thrives in full sun and sharp drainage, tolerates drought and poor soil, and has a strong, slightly bitter, minty-camphor scent.

Mature size: 40-60 cm tall and 30-45 cm wide.

Watch for — Root rot in wet soil: Heavy or poorly drained ground and overwatering rot the roots. Plant in gritty, free-draining soil and water sparingly, especially over winter.

How to tell hyssop needs repotting

Repotting on a calendar is less reliable than reading the plant. For hyssop, watch for these signs:

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot hyssop

Every 2–3 years, into bone-dry mix. Hyssop's growth habit — compact, bushy, semi-evergreen sub-shrub with woody-based upright stems clad in narrow dark-green leaves, topped by dense whorled spikes of blue-purple (sometimes pink or white) flowers in summer. — sets the pace. Hyssop is a hardy, semi-evergreen Mediterranean sub-shrub in the mint family, grown for its narrow aromatic leaves and spikes of deep blue-purple summer flowers that draw bees and butterflies. It thrives in full sun and sharp drainage, tolerates drought and poor soil, and has a strong, slightly bitter, minty-camphor scent.

What size pot to step hyssop up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Hyssop stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot hyssop

Spring or summer, while hyssop is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting hyssop

  1. Repot dry. Do not water hyssop for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
  2. Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty light, free-draining, neutral to alkaline soil, ph 6.5-8.0 ready.
  3. Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
  4. Pot into dry mix. Set hyssop at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
  5. Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep hyssop completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for hyssop

Hyssop wants light, free-draining, neutral to alkaline soil, ph 6.5-8.0. Prefers lean, gritty, well-drained soil and dislikes heavy, wet ground. Add grit to clay; thrives on poor, chalky soils where richer plants struggle. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting hyssop — frequently asked questions

How often should you repot hyssop?

Every 2–3 years, into bone-dry mix for hyssop. Repot hyssop every 2–3 years into a snug pot of light, free-draining, neutral to alkaline soil, ph 6.5-8.0, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does hyssop need?

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Hyssop stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot hyssop?

Spring or summer, while hyssop is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Should you water hyssop after repotting?

No — not straight away. Repot hyssop into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise hyssop after repotting?

Not immediately. Wait about 3 weeks after repotting hyssop. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.

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