How to Grow Peppermint Canada

Growth Stages

Stage	BBCH	Notes
Planting and containment	0	RHS: use a bottomless container or a large-holed pot sunk into the soil to stop the spreading rhizomes taking over a bed; repot every few years. NC State: space 18in apart in the ground, or grow in a 12-16in pot to help control spread -- describes the plant as high-maintenance due to aggressive rhizome spread.
Establishment care	3	Minimum 3 hours of sun daily; does well in partial shade (2-6 hours) or full sun (6+ hours) (NC State). Regularly pinch off branch tips to promote bushier, leafier growth and increase available harvest (NC State).
Harvest and cutting back	8	RHS: harvest late spring to autumn, before stems die back over winter, picking young soft shoot tips regularly for the best flavour and to keep plants compact. After flowering ends, cut the whole plant down to about 5cm (2in) from the base to encourage fresh growth (RHS).
Propagation	0	A sterile hybrid -- cannot be grown from seed (NC State). Propagate instead by division of rootballs in spring or autumn, softwood cuttings (stems root readily in a jar of water), rhizome cuttings taken at any time of year, or runners/layering (RHS; NC State).

Quick Facts

Factor	Value
Drainage	Good drainage or moist conditions; tolerant of occasionally wet soil; avoid dry soils (NC State). RHS notes it tolerates a range of soil types.
Lifecycle	Vigorous, rhizomatous, spreading perennial herb. NC State notes it is resistant to deer, rabbits and insect pests in the general ornamental sense, while RHS lists real pest/disease pressure specific to UK growing conditions (mint rust, blue mint beetle, aphids, mint moth caterpillars) -- both kept as genuinely different pictures rather than reconciled to one. Sterile hybrid: NC State states it does not produce viable seed, so propagation is only by division, stem cuttings, runners or layering -- RHS agrees, adding that rhizome cuttings can be taken at any time of year and stems root readily in a jar of water.
Edible parts	leaves, flowers

At a Glance

Harvest & Storage

When to pick: RHS: harvest late spring to autumn, before stems die back over winter; pick young, soft shoot tips for the most intense flavour, and harvest regularly to keep plants compact.

Storage

Use fresh, or dry the leaves and flowers, for teas, beverages, jellies, syrups and candies (NC State).

Diseases

Mint rust

moderate

Named directly by RHS: dusty orange, yellow and black leaf spots.

Pests

Mint moth (caterpillars)

low

Pyrausta aurata

Named directly by RHS as causing occasional damage.

Aphids

low

Aphididae (various spp.)

Named directly by RHS as causing occasional damage.

Blue mint beetle

moderate

Chrysolina coerulans

Named directly by RHS -- a genuinely recent arrival, established in southern and eastern England only since 2011.

What the research guides add

Peppermint’s main trait is that it spreads, and NC State’s advice is mostly about containing it.

• An upright perennial herb, a cross between watermint and spearmint, that spreads by rhizomes and forms an aggressive ground cover. (NC State Extension)
• It prefers rich, moist soil in partial shade, tolerates various light levels and soils except dry ones, and does best at pH 6.0 to 7.0; it needs only about three hours of sun a day. (NC State Extension)
• Consider growing it in a pot 12 to 16 inches wide to control its spread; if planting in the ground, space plants 18 inches apart. (NC State Extension)
• Regularly pinching off the branch tips promotes bushier, leafier growth. (NC State Extension)

Peppermint in Canada: climate data

Frost dates and frost-free days are the median values for the stations in Environment and Climate Change Canada climate normals with the highest data-quality rating (1981–2010 normals).

Sources for this section

• NC State Extension: Mentha × piperita (Plant Toolbox)

Section researched and checked on 25 October 2026 by the SoilCommander Editorial Team. How we check facts: editorial policy.

Sources

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 peppermint; they describe the plant itself, which is the same wherever it grows.