When to Plant Lavender in Ontario – 2026
Published: April 27, 2026
Ontario spans Canadian hardiness zones across multiple cities. Plant lavender in Ontario from may (after last frost, before victoria day).. In Ontario and Quebec, Victoria Day weekend is too early to plant lavender — wait until cool May nights pass. Plant after Victoria Day in southern Ontario; late May in Ottawa and Montreal.
Lavender Planting Window for Ontario
Plant lavender in spring after last frost (Zones 5–7) or fall (Zones 8–9). Needs full sun, excellent drainage, and alkaline to neutral soil (pH 6.5–7.5). Avoid clay soils — lavender roots rot in wet conditions.
For Ontario specifically, the recommended planting window is May (after last frost, before Victoria Day).. Ontario gardens across multiple climate zones — adjust based on your specific city. In Ontario and Quebec, Victoria Day weekend is too early to plant lavender — wait until cool May nights pass. Plant after Victoria Day in southern Ontario; late May in Ottawa and Montreal.
English lavender (Lavandula angustifolia) is hardy to Zone 5 — survives -28°C with good drainage and snow cover. 'Hidcote' and 'Munstead' are the most cold-tolerant. Spanish, French, and Italian lavenders are tender and survive only in Zone 7+ (BC coast).
Ontario Cities — Lavender Planting Dates
Each city below has local frost dates, Canadian zone, and a city-specific lavender planting calendar.
Best Lavender Varieties for Ontario
For Ontario , choose varieties rated for your zone or one zone colder for reliable winter survival. The Canadian-bred or tested varieties below perform well in Ontario conditions.
Compact (45 cm), deep purple flowers. Most cold-hardy named cultivar. The standard for Ontario, Quebec, and Atlantic Canada.
Slightly larger (60 cm), softer mauve flowers. Earlier bloomer than 'Hidcote'. Equally cold-hardy.
Patented hybrid bred for humidity tolerance and slightly extended cold hardiness. The best choice for Ottawa and Montreal Zone 5a.
Hybrid of English × Spike lavender. Larger plant (90 cm), longer flower spikes. Higher essential oil yield than English types.
Slightly more cold-hardy than 'Hidcote' — the best choice for Alberta gardeners attempting lavender in Zone 4.
Caring for Lavender in Ontario
Sow method: transplant (spring or fall). The steps below adapt the general planting advice for Ontario's climate and timing.
- →Choose a site with full sun (8+ hours) and excellent drainage — sloped beds, raised beds, or rocky soils are ideal.
- →Test soil pH; amend with lime to bring pH to 6.5–7.5 if below 6.5.
- →Improve clay soils with 30% pumice or coarse sand mixed in — never plant lavender in unamended clay.
- →Space plants 60–90 cm (2–3 ft) apart for English lavender; 90–120 cm (3–4 ft) for Lavandin.
- →Water deeply once at planting; reduce to once every 10–14 days for the first month, then minimal irrigation.
- →Skip mulch close to the crown — wet mulch causes crown rot. Use coarse gravel or pea stone if mulch is desired.
Frequently Asked Questions about Lavender in Ontario
When should I plant lavender in Ontario?
Plant lavender in Ontario from may (after last frost, before victoria day).. Plant lavender in spring after last frost (Zones 5–7) or fall (Zones 8–9). Needs full sun, excellent drainage, and alkaline to neutral soil (pH 6.5–7.5). Avoid clay soils — lavender roots rot in wet conditions.
What Canadian zones are in Ontario?
Ontario spans multiple Canadian hardiness zones depending on location. Major cities and their zones: Toronto (Zone 6b), Ottawa (Zone 5b), Hamilton (Zone 6b), London (Zone 6a), Kitchener (Zone 6a). Check planthardiness.gc.ca for your exact postal code.
What lavender varieties grow best in Ontario?
English lavender 'Hidcote' (Zone 5+): Compact (45 cm), deep purple flowers. Most cold-hardy named cultivar. The standard for Ontario, Quebec, and Atlantic Canada. English lavender 'Munstead' (Zone 5+): Slightly larger (60 cm), softer mauve flowers. Earlier bloomer than 'Hidcote'. Equally cold-hardy.