How to Grow Lemon Thyme USA

Growth Stages

Stage	BBCH	Notes
Planting	0	RHS: plant mid-spring to early summer, spaced 20-30cm (8-12in) apart, or in a container at least 15cm wide by 10cm deep with up to 25% horticultural grit for drainage. NC State: needs under 12in of space given its compact 6-12in height, 1ft width.
Establishment	3	Full sun, free-draining soil (RHS; NC State). NC State: medium growth rate, low maintenance, mounding form with a spreading tendency; nectar attracts bees and butterflies.
Overwintering	0	RHS: most widely sold varieties tolerate UK frost; high-rainfall areas benefit from cloche protection; containers do best in a sheltered spot near a building, in a rain shadow.
Harvest	8	RHS: soft new growth in late spring and summer has the best flavour; harvestable year-round as an evergreen, snipping young shoots whenever needed. NC State: best harvested in the morning, just before flowering.

Quick Facts

Factor	Value
Drainage	Free-draining (RHS); NC State: sand, loam/silt or shallow rocky, good drainage, occasionally dry; root rot occurs in too-moist soil.
Lifecycle	Compact, bushy, mounding evergreen sub-shrub. NC State: herbaceous perennial, mounding form with a spreading tendency, medium growth rate, low maintenance. RHS covers it on the same combined thyme growing guide as common thyme, distinguished mainly by flavour: "lemon scent and flavour" versus common thyme's "sweet, earthy, peppery taste."
Edible parts	leaves, flowers

At a Glance

Harvest & Storage

When to pick: RHS: soft new growth in late spring and summer has the best flavour; harvestable year-round as an evergreen, snipping young shoots whenever needed. NC State: best harvested in the morning, just before flowering, when most aromatic.

Storage

RHS: dried leaves keep strong flavour stored in airtight jars.

Diseases

Foot and root rot (general)

moderate

Named directly by NC State: root rot occurs in too-moist soils, the only significant risk noted.

Pests

Sage leafhopper (leafhoppers)

low

Eupteryx spp.

Named directly by RHS ("sage leafhoppers"), causing coarse pale mottling.

Snails

low

Gastropoda (snails, various spp.)

Named directly by RHS, vulnerable young shoots.

Slugs

low

Gastropoda (slugs, various spp.)

Named directly by RHS, vulnerable young shoots.

Rosemary beetle

moderate

Chrysolina americana

Named directly by RHS.

Sources

1. North Carolina State University Extension (Plant Toolbox) - Thymus x citriodorus (Lemon Thyme)

   Light: full sun (6+ hours) or partial sun. Soil: sand, loam/silt or shallow rocky; good drainage, occasionally dry. Size: 6-12in height, 1ft width, under 12in space needed. Hardiness USDA zones 5a-8b. Propagation: division. Pests/diseases: no significant problems; root rot occurs in too-moist soils -- the only major concern is overwatering. Growth: medium growth rate, low maintenance, mounding form with spreading tendency. Edibility: leaves and flowers eaten raw in salads or cooked; also used in herbal medicine and aromatherapy. Wildlife: nectar attracts pollinators, specifically bees and butterflies. Harvest: best in the morning, just before the plant flowers, when most aromatic and flavourful.

These source is specific to this region. The full list of 2 sources behind this guide (North Carolina State University Extension (Plant Toolbox), Royal Horticultural Society) is in the references of our UK guide to lemon thyme; they describe the plant itself, which is the same wherever it grows.