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Lemon Balm
Melissa officinalis
Lemon Balm is grown for its foliage rather than flowers, giving the garden structure and color all season long.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Lemon Balm
Plant it in part sun. It prefers moderate water. It is hardy in USDA zones 3–7. Expect it to reach about 24 in tall and 20 in wide at maturity, in roughly 2 years (not yet checked).
What this means
Written with AI assistance and not yet checked plant by plant against recorded sources, so treat every fact above as a starting point. Its scientific name was checked against botanical registries, an audit keeps its values consistent with the rest of the library, and a July 2026 review re-read the main facts of every plant then in the library against horticultural authorities without recording a source for each, which is why none of that counts as checked here. The source-by-source check is working through the whole library in the open, and a checked plant says so in this row.
When to plant Lemon Balm
Plant Lemon Balm in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 5, the middle of this plant's hardy range, start with zone 5 in May. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Lemon Balm get?
24 intall5 ft 7 inan adult20 inwideSee Lemon Balm in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Lemon Balm
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Lemon Balm about 20 in apart, center to center, so each plant has room to reach its full width.
Add Lemon Balm to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Good to know about Lemon Balm
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note. A note reports what its source says; where that differs from a fact above, the fact above is this entry's stored value, and its mark says whether it has been checked.
Worth knowing
The lemon scent comes from volatile oils in the leaves, chiefly citral and citronellal. Crush a leaf and those oxygenated monoterpenes are what you smell. per Molecules
Warm-end zone is disputed
Every source agrees it is cold-hardy to zone 3. Only the warm end splits: NC State caps it at zone 7, Wisconsin runs it to zone 9. per NC State and Wisconsin
How it spreads
It spreads and needs containing. NC State says by rhizomes, so use a pot; Wisconsin, Illinois and Utah State say heavy self-seeding, so deadhead before seed set. per NC State and Wisconsin
Edible and pet-safe
A culinary and tea herb: the lemon-scented leaves and flowers are edible. ASPCA lists it non-toxic to dogs, cats and horses. per ASPCA and NC State
Feeds bees despite tiny flowers
The small white summer flowers look minor but are nectar-rich; Wisconsin notes it is sometimes planted just to feed bees, and it draws butterflies too. per NC State and Wisconsin
Deer and rabbits avoid it
NC State lists it deer resistant and Wisconsin says it is rarely, if ever, eaten by deer or rabbits; the aromatic foliage is the likely reason. per NC State and Wisconsin
Cut back for fresh leaves
When it looks leggy or tired, cut it back by a third to a half after flowering for a clean flush; frequent harvest keeps it bushy. per Wisconsin
What pairs well with Lemon Balm
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Arborvitae
Takes full sun to part sun and moderate water; evergreen, so the bed keeps its shape through winter.
Bugleweed
Takes part sun to part shade and moderate water; evergreen, so the bed keeps its shape through winter; lower at 6 in, for the front of the border.
Rhododendron
Takes part sun to part shade and moderate water; evergreen, so the bed keeps its shape through winter; taller at 6 ft, for the layer behind it.
Boxwood
Takes full sun to part sun and moderate water; evergreen, so the bed keeps its shape through winter; taller at 4 ft, for the layer behind it.
Periwinkle
Takes part sun to part shade and low to moderate water; evergreen, so the bed keeps its shape through winter; lower at 6 in, for the front of the border.
Snow-in-Summer
Takes full sun to part sun and low to moderate water; evergreen, so the bed keeps its shape through winter; lower at 6 in, for the front of the border.
Maiden Grass
Takes full sun to part sun and low to moderate water; its seed heads stand through winter, for structure and the birds; taller at 6 ft, for the layer behind it.
Juniper
Takes full sun to part sun and low to moderate water; evergreen, so the bed keeps its shape through winter; stands well above at 13 ft, a canopy to plant beneath.
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.