Succession Planting in Canada — How to Harvest All Season
Stagger your sowings and a short Canadian season delivers a steady harvest for months instead of one overwhelming glut. The four methods, the best crops, the intervals, and the count-back-from-frost rule.
Quick answer: Succession planting means sowing a fast crop — lettuce, radishes, beans, spinach — in small batches every 2–3 weeks instead of all at once, so it matures a little at a time. It also covers replanting a bed the moment a crop finishes (after garlic, after peas) and tucking fast crops between slow ones. In Canada the key rule is timing the last sowings: count the crop's days to maturity, add about 14 days for the fall slowdown, and count back from your first fall frost — that is your last-sow date.
Every Canadian gardener knows the problem: the lettuce all matures in the same fortnight, the beans come in faster than anyone can eat them, and then the garden sits half-empty for the rest of the summer. Succession planting is the fix. Instead of one big sowing, you spread your sowings out — and instead of one big harvest, you get a steady supply that matches how a household actually eats.
It is also how you get the most out of a short season and a small garden. A single bed, succession-planted, can produce two or even three crops between the last spring frost and the first fall frost. This guide covers the four methods, the crops worth doing it with, the intervals, and the Canadian timing rule that decides when to stop.
The Four Methods of Succession Planting
1. Staggered sowing of the same crop
The classic method: sow a short row of a fast crop, then sow another short row 2–3 weeks later, and keep going. A 1-metre row of lettuce sown every two weeks gives you a few heads ready each week, instead of twenty heads bolting at once. This is the method most people mean by "succession planting."
2. Follow-on cropping
When one crop finishes, plant a different crop in the same space. Garlic harvested in July leaves a prime, weed-free bed — follow it with bush beans or fall greens. Spring peas finishing in early summer can be followed with carrots or beets. One bed, two or three crops per season.
3. Interplanting fast crops with slow ones
Sow a fast crop in the gaps around a slow one and harvest it before the slow crop needs the room. Radishes between carrots are the classic pairing — the radishes are pulled in a month, well before the carrots fill out, and they even mark the carrot row while it germinates.
4. Planting varieties with different maturity dates
Sow early, mid-season and late varieties of the same crop on the same day, and they mature in sequence on their own. This works well for sweet corn, potatoes, and cabbage — crops where repeated sowing is awkward but you still want a spread-out harvest.
Best Crops for Succession Planting
The crops worth succession planting are the fast ones you harvest young and eat steadily. Re-sow on the interval below until you reach your last-sow date for the season.
| Crop | Days to maturity | Re-sow every | Notes |
|---|---|---|---|
| Radishes | 25–30 | 2 weeks | The fastest crop; pause in mid-summer heat |
| Leaf lettuce & salad mix | 30–55 | 2 weeks | Bolts in heat — use shade or bolt-resistant types in summer |
| Arugula | 30–40 | 2–3 weeks | Best in spring and fall; sharp and bolt-prone in heat |
| Spinach | 40–50 | 2–3 weeks | A spring and fall crop; skip the hottest weeks |
| Salad turnips | 35–50 | 2–3 weeks | Fast and frost-hardy; great for late sowings |
| Bush beans | 50–60 | 2–3 weeks | Frost-tender — only sow after the last spring frost |
| Beets | 50–65 | 3 weeks | Greens and roots both usable; frost-hardy |
| Carrots | 60–75 | 3 weeks | Keep the seed bed moist until it germinates |
| Kohlrabi | 50–60 | 3 weeks | Frost-hardy; quick and trouble-free |
| Green onions | 50–70 | 3 weeks | Very hardy; sow right up to the late-season cutoff |
| Cilantro & dill | 40–55 | 2–3 weeks | Both bolt fast — frequent re-sowing is the only way to keep a supply |
The Canadian Timing Rule — When to Stop
The one calculation that governs succession planting in a short season is the last-sow date for each crop. Sow after it and the crop runs out of season before it matures. The formula:
Last-sow date = first fall frost − (days to maturity + 14-day fall factor)
The 14-day "fall factor" accounts for the fact that crops grow slower as fall light fades and temperatures drop — a carrot that matures in 65 days in July may need 80 days from an early-September sowing. Worked example: if your first fall frost is around October 1 and you want to sow bush beans (55 days to maturity, frost-tender), then 55 + 14 = 69 days; counting back from October 1 gives a last-sow date of around July 24. Sow beans after that and frost will catch them.
Two things make this easier. First, find your own first fall frost date with the frost date calculator or the frost date hub. Second, the harvest date calculator will project a maturity date from any sowing date so you can check it lands before frost.
Frost-hardy crops bend the rule. Spinach, kale, lettuce, radishes, salad turnips, green onions and arugula all tolerate light frost — some are sweetened by it — so they can be sown later than the formula suggests and harvested into the fall. Save your latest sowings for these hardy crops, and use the strict last-sow date for frost-tender ones like beans.
A Simple Season-Long Schedule
Adjusted for your own frost dates, a succession plan across a typical Canadian season looks like this:
- Early spring (as soon as soil can be worked): first sowings of frost-hardy crops — spinach, radishes, lettuce, peas, salad turnips.
- Through spring: re-sow those hardy crops every 2–3 weeks; start carrots and beets.
- After the last spring frost: begin bush beans and re-sow them every 2–3 weeks; keep greens going with bolt-resistant varieties.
- Mid-summer: follow-on cropping — replant beds emptied by garlic and peas; pause heat-sensitive greens.
- Late summer: final sowings, all of frost-hardy crops — spinach, lettuce, radishes, kale, salad turnips — for a fall harvest.
- Stop each crop once you pass its last-sow date.
Crops Not Worth Succession Planting
Succession planting only pays off for fast crops harvested young. Long-season crops that take most of the summer and are harvested once (or picked continuously from a single planting) should be planted just once, at the right time:
- Tomatoes, peppers, eggplant — long-season, and a single plant crops for weeks once it starts.
- Winter squash, pumpkins, melons — need the whole season; there is no time for a second round.
- Bulb onions and leeks from seed, Brussels sprouts, parsnips — very long-season; one planting fills the year.
- Garlic — planted once in fall, harvested the next summer; but the bed it frees up is perfect for a follow-on crop.
Common Succession-Planting Mistakes
Sowing too much at once. A full packet of lettuce in one go is the exact glut succession planting exists to prevent. Sow short rows.
Forgetting to sow the next batch. The whole system fails if you skip a round. Put the re-sow dates in a calendar, or sow when the previous batch shows its first true leaves.
Sowing past the last-sow date. A late sowing of a frost-tender crop just feeds the compost. Switch to frost-hardy crops for the final rounds.
Leaving emptied beds bare. An empty mid-summer bed is wasted season. Have follow-on seed ready before the first crop comes out.
Not feeding the soil between crops. A second or third crop draws on the same soil. Work in compost before replanting a bed.
Frequently Asked Questions
Does succession planting work in raised beds and containers?
Yes — it is arguably even more useful there, because raised-bed and container space is limited and you want every square foot working. The methods are identical: stagger short sowings, replant as soon as something finishes, and tuck fast crops around slower ones. Containers warm and dry faster, so keep the soil consistently moist for good germination.
Can I succession plant tomatoes?
Not usefully in Canada. Tomatoes need most of the season to crop, so a second, later planting would not have time to ripen before fall frost. A single planting of indeterminate tomatoes already produces over many weeks, which gives the steady harvest succession planting is meant to deliver. Put your effort into succession sowing the fast crops instead.
Should I start succession crops indoors or sow direct?
Most succession crops — radishes, lettuce, spinach, beans, carrots, beets, turnips — are best sown directly into the garden, because they are fast, dislike root disturbance, or both. Direct sowing also makes the staggered schedule simple. Starting indoors is worth it mainly for a head start on the very first spring batch of lettuce; after that, sow direct.
How do I keep summer sowings from failing in the heat?
Mid-summer is the hardest time for succession sowing — lettuce and spinach seed germinates poorly in hot soil and bolts quickly. Sow in the cooler part of the bed or under light shade cloth, water the seed row daily to keep it cool and moist, and choose heat-tolerant or bolt-resistant varieties. Many gardeners simply pause leafy greens for the hottest weeks and resume in mid-to-late summer for the fall crop.
Plan Your Succession Garden
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