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How to Grow Thyme: The Hardest Herb to Kill, If It Drains

Thyme wants gravel, sun and neglect. It survives drought and frost easily and dies in wet clay — which is the only real decision you have to make.

By Zakaria 2 min read Save to Pinterest — opens Pinterest in a new tab
Thyme herb plant
Photo: photosforyou, Pixabay Content License, via Pixabay
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Thyme is close to unkillable in gravel and sun, and reliably dies in wet clay. That is the whole of it.

Which thyme

The ones worth knowing
TypeHabitUse
Common thyme (T. vulgaris)Upright, ~30 cmThe culinary one. Strongest flavour
Lemon thyme (T. × citriodorus)Upright, slightly tenderExcellent culinary, citrus note
Creeping thyme (T. serpyllum)Flat matGround cover, paving, gravel. Milder
Variegated formsUprightOrnamental, less hardy
Wild thymeMatBee planting, lawns

Planting

  • Sun: full, all day if possible
  • Soil: poor, stony, free-draining. Alkaline suits it; it grows on limestone in the wild
  • Mound it slightly in heavy ground so water runs away from the crown
  • Gravel mulch around the stems — the single most useful thing you can do for it
  • Spacing: 20–30 cm for common thyme, closer for creeping as ground cover
  • Pots: terracotta, cactus compost or compost cut heavily with grit

The mulch choice matters more than it sounds

Bark or compost mulch holds moisture against the stems and is a reliable way to rot a thyme.

Gravel, grit or stone chippings. They keep the base dry, reflect heat, and keep foliage off wet soil.

Harvest and trim

  • Cut sprigs, not individual leaves — the plant branches from where you cut
  • Pick year-round in mild areas; growth stalls in winter but the leaves stay usable
  • Flavour peaks just before flowering, which is when to cut a batch for drying
  • Trim by a third after flowering, staying in the green
  • Leave some flowers — thyme in bloom is among the best bee plants in a garden

Layering, the easiest renewal in the garden

Thyme layers itself if you let it. To do it deliberately:

  1. Pick a low outer stem and lay it on the soil
  2. Pin it down with a stone or a bent wire
  3. Cover the middle section with grit or gritty compost, leaving the tip exposed
  4. Leave it for a season
  5. Cut it free from the parent the following spring and lift it with its roots

No propagator, no mist, no compost mix to get right. It costs one stem and a stone, and it is why a thyme plant going woody is never really a problem — only a prompt.

Step by step

Time
P90D
Cost
8
You need
A thyme plant, or seed, Grit or coarse sand, Gravel for a surface mulch
Tools
Scissors or secateurs

  1. Choose the sunniest, driest spot you have

    Full sun and sharp drainage. Thyme grows wild on limestone hillsides and gravel, and the conditions that suit a vegetable bed will kill it within a winter.

  2. Open up heavy soil

    Fork grit or coarse sand into clay, or plant into a raised bed, a gravel garden, a wall or a pot. Planting on a slight mound so water runs away from the crown costs nothing and makes a real difference.

  3. Plant shallowly and mulch with gravel

    Set the plant at the depth it was in its pot and spread gravel or grit around the stems. Gravel keeps the base dry and the foliage off wet soil, which is where rot starts.

  4. Water it in, then largely stop

    Keep a new plant lightly moist for a few weeks while it roots. After that, an established thyme in the ground needs water only in prolonged drought. In pots, let it dry out fully between waterings.

  5. Never feed it

    Fertiliser produces soft, leggy growth with weak flavour and poor winter hardiness. Thyme grown lean tastes far stronger.

  6. Trim after flowering

    Cut the plant back by about a third once the flowers fade, staying in the green growth. That keeps it compact and delays the bare woody base.

  7. Harvest by cutting sprigs

    Take whole sprigs from the growing tips rather than stripping leaves. Flavour peaks just before flowering if you are cutting a batch to dry.

  8. Replace it every three or four years

    Thyme goes woody and sparse with age and will not resprout from bare wood. Layer a low stem by pinning it under grit, or take cuttings in early summer, and replace the parent before it collapses.

Common questions

What conditions does thyme need?

Full sun and sharp drainage, and very little else. It originates on dry rocky Mediterranean hillsides and is adapted to poor stony soil, strong light and long dry periods, so the fundamental requirement is ground that water moves through quickly. Thyme tolerates drought, frost, wind and outright neglect; what it does not tolerate is sitting wet, particularly through winter, and that single factor accounts for nearly every dead plant.

Does thyme come back every year?

Yes, common thyme and creeping thyme are hardy perennial sub-shrubs that return reliably in most temperate gardens, many of them tolerating around minus 15°C. Lemon thyme and the variegated forms are somewhat less hardy. As with sage and rosemary, winter wet kills more plants than winter cold does, so a thyme in gritty soil or a raised bed will come through conditions that finish one planted in heavy clay.

How do you keep thyme from getting woody?

Trim it by about a third every year after flowering, always cutting within the green growth, and replace the plant every three or four years. Thyme builds bare woody stems as it ages and will not reliably produce new shoots from that old wood, so a hard renovation prune usually kills it. The easy renewal is layering — pin a low stem down under a little grit, leave it to root, then sever it the following spring.

Can you grow thyme indoors?

With difficulty. Thyme needs more direct light than most windowsills provide, and indoor plants typically go pale, leggy and weak-flavoured within a couple of months. A south-facing sill is the minimum, a grow light helps considerably, and the compost must be gritty and allowed to dry fully between waterings. A pot that spends summer outdoors and winter inside does better than one kept indoors permanently.

What is the difference between creeping thyme and common thyme?

Common thyme, Thymus vulgaris, is the upright culinary plant with the strongest flavour, growing to about 30 cm. Creeping thyme, usually Thymus serpyllum, is a low mat-forming plant grown mainly as ground cover, between paving and in gravel, and while it is edible the flavour is generally milder. Both are excellent for bees in flower. For cooking, grow common or lemon thyme; for a path or a gravel garden, grow creeping.

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