Watering schedule

How often to water Cat Thyme (Teucrium marum) — the schedule

Also called Cat Thyme, Kitty Crack, Mediterranean Germander, Cat Crack.

More about cat thyme

Watering at a glance

Base rhythm	Water sparingly; allow soil to dry between waterings
Spring / summer	Spring and summer: water deeply but only when the top few centimetres are properly dry — roughly weekly in the ground, more often only for pots in heat.
Autumn	Autumn: cut right back as growth slows; established plants need very little.
Winter	Winter: keep nearly dry, especially in pots — wet winter soil is the classic killer of rosemary, lavender and thyme.
Light	Direct sun (at least 4-6 hours)

About Cat Thyme

Teucrium marum · also called Cat Thyme, Kitty Crack · herb

Teucrium marum is a compact, evergreen subshrub native to the western Mediterranean, particularly Sardinia and the Balearic Islands. It produces grey-green, downy, aromatic foliage and small pink flowers on slender spikes in late summer and autumn. Full sun and sharply drained, alkaline soil are essential — winter wet is more damaging than frost. The plant is mildly toxic if ingested; the RHS advises wearing gloves when handling, though it is famous for attracting cats with a catnip-like effect.

Ideal humidity: Low

Watch for — Root rot from winter wet: The most frequent killer; ensure the planting site has near-perfect drainage and consider a grit mulch around the collar to divert standing water.

The watering schedule, season by season

Cat Thyme is a lean, sun-loving Mediterranean herb — it grows best kept on the dry side and rots fast if it is watered like a leafy plant. The base rhythm for cat thyme is water sparingly; allow soil to dry between waterings, but the real interval moves with the season, the light and the pot — so treat the figures below as a starting point and always confirm with the plant itself.

Spring & summer (active growth): Spring and summer: water deeply but only when the top few centimetres are properly dry — roughly weekly in the ground, more often only for pots in heat.
Autumn (slowing down): Autumn: cut right back as growth slows; established plants need very little.
Winter (rest / dormancy): Winter: keep nearly dry, especially in pots — wet winter soil is the classic killer of rosemary, lavender and thyme.

Drought-tolerant once established; overwatering and waterlogged soil are the most common causes of failure — err on the side of too dry rather than too wet.

Want this turned into a live reminder that adjusts to your home and the weather? The Growli watering calculator takes your pot size, light and season and returns a starting interval for cat thyme in seconds.

How to tell cat thyme needs water

A calendar is the worst way to water cat thyme. Check the plant and the soil instead — for this species, look for these signals in order:

The top 3-4 cm of soil is fully dry and the pot is light.
Foliage looks slightly dull or limp in heat (recovers fast once watered).
For potted plants, the rootball has shrunk slightly from the sides.

The most reliable single check is the first one on that list. When two signals agree, water; when they disagree, wait a day and look again — under-watering cat thyme for a day is almost always safer than over-watering it.

Overwatering vs underwatering cat thyme

The two failure modes can look alike at a glance, so check the soil weight and wetness before you decide. For cat thyme specifically:

Signs you are overwatering

Yellowing, blackening or dropping lower foliage; a sour, wet pot.
Soft, rotting stems at the base — often fatal in rosemary and lavender.
Sudden collapse despite "looking thirsty" (it was actually drowning).

Signs you are underwatering

Crisp, brittle, browning foliage and stalled growth (less common — these herbs are drought-hardy).
For young, unestablished plants only, wilting in extreme heat.

Overwatering and rich wet soil are what kill cat thyme, not drought. It evolved on dry, stony hillsides — err on the side of too little.

Water quality notes

Tap water is fine for cat thyme; drainage and restraint matter, not water type.

Seasonal and environmental adjusters

Every figure above shifts with the conditions in your home. For cat thyme, the levers that matter most are:

Sharp drainage is everything — grit in the mix and a terracotta pot keep it alive.
Established plants in the ground are highly drought-tolerant and rarely need watering at all.
Pots dry faster and need more attention than open ground, but still let them dry between waterings.

Pot choice is part of this too — work out the right size with the pot size calculator, since a pot that is too big stays wet long enough to rot the roots of cat thyme.

Cat Thyme watering — frequently asked questions

How often should I water cat thyme?

Water cat thyme water sparingly; allow soil to dry between waterings. Spring and summer: water deeply but only when the top few centimetres are properly dry — roughly weekly in the ground, more often only for pots in heat. Winter: keep nearly dry, especially in pots — wet winter soil is the classic killer of rosemary, lavender and thyme.

How do I know when cat thyme needs water?

The top 3-4 cm of soil is fully dry and the pot is light. Foliage looks slightly dull or limp in heat (recovers fast once watered). For potted plants, the rootball has shrunk slightly from the sides. The single most reliable test for cat thyme is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered cat thyme look like?

Yellowing, blackening or dropping lower foliage; a sour, wet pot. Soft, rotting stems at the base — often fatal in rosemary and lavender. Sudden collapse despite "looking thirsty" (it was actually drowning). Overwatering and rich wet soil are what kill cat thyme, not drought. It evolved on dry, stony hillsides — err on the side of too little.

What are the signs of an underwatered cat thyme?

Crisp, brittle, browning foliage and stalled growth (less common — these herbs are drought-hardy). For young, unestablished plants only, wilting in extreme heat.

Can I use tap water on cat thyme?