Native & adapted

Creeping thyme

Thymus serpyllum

Also known as Wild thyme · Mother of thyme

A low, fragrant mat for stepping-stone joints and cool garden edges, best where desert heat is moderated by elevation or afternoon shade.

Edible herbPollinatorWalkableCold hardy

Landscape layersGround cover

Mature size

2–6 in. tall × 12–24 in. wide

Climate fit

Valley suburbs · USDA 9a–9b · Desert outskirts · USDA 8b–9b · High desert · USDA 6a–8b

Special categories

POLLINATOR ATTRACTING · EDIBLE

Hardiness guidance

USDA zones 4–9; cold-hardy but challenged by extreme low-desert summer heat

Typical harvest

Snip leafy tips before or during early bloom

Before you plant

These conditions determine whether it will thrive.

Cold hardiness

Hardy here

Very cold hardy (it grows up to zone 4), so frost is never an issue here.

Heat tolerance

Needs afternoon shade

Summer is the hard part. Give it morning sun and afternoon shade, ideally an east exposure, and keep it off hot west sides where it scorches and thins out.

Sources:

extension.arizona.edu

Right plant, right place

Will Creeping thyme grow at your Arizona property?

Best as a small-scale living joint filler, herb-garden edge, or high-desert groundcover—not as a broad replacement for lawn in reflected Phoenix heat.

Best regional fit: Valley suburbs · USDA 9a–9b, Desert outskirts · USDA 8b–9b, High desert · USDA 6a–8b.

Light

Sun exposure

Full sun in cooler climates; morning sun and afternoon shade in the Phoenix low desert.

Water

Irrigation

Moderate and regular in the low desert, with fast drainage. It is drought tolerant in cooler climates but not a zero-water Phoenix groundcover.

Harvest

How to use it

Use the aromatic leaves like other culinary thyme; avoid harvesting from paths exposed to pets or foot traffic.

Planting & stewardship

How to help Creeping thyme thrive

1
Tuck plants between stones or along edges where the crown stays dry and roots can reach cooler soil.
2
Provide afternoon shade below roughly 3,000 feet and watch closely during the first summer.
3
Trim lightly after flowering to keep the mat dense.
4
Replace irrigation frequency with deeper watering as roots establish, without letting plants remain soggy.

Read the horticultural reference ↗