Succession planting: build the schedule

Succession planting is the practice of making multiple small sowings of a crop at regular intervals rather than one large sowing, so that harvest is spread over weeks rather than concentrated in one rush. Per Cornell Cooperative Extension, succession planting is the single most effective technique.

—- title: "Succession planting: build the schedule" slug: succession-planting-spreadsheet hub: vegetables category: "Advanced technique" description: "A sourced guide to building a succession planting schedule for continuous vegetable harvest, with calculation methods and crop-specific intervals by zone." date: 2026-06-10 updated: 2026-06-10 author: "Thomas A." reading_time: 9 —-

Succession planting is the practice of making multiple small sowings of a crop at regular intervals rather than one large sowing, so that harvest is spread over weeks rather than concentrated in one rush. Per Cornell Cooperative Extension, succession planting is the single most effective technique for maintaining a consistent supply of fast-maturing crops like lettuce, spinach, radishes, and beans throughout the season.

The core calculation

Per Penn State Extension and Cornell Cooperative Extension, every succession schedule is built from three numbers:

1. Days to harvest (from seed to first harvest; found on seed packet)
2. Harvest window (how many days the crop produces usably before it declines, bolts, or becomes unusable)
3. Amount per interval (how much your household uses in one week)

Interval formula:

Sowing interval (days) = Harvest window ÷ Number of successions planned in that window

Or, simpler:

Sow a new batch every N days, where N is your household's "use-up window" for that crop

Example for lettuce (leaf type):

• Days to harvest: 45 days from seed
• Harvest window before bolting: 21 days (3 weeks) in summer heat
• Your household: uses 1 head per week
• Succession interval: sow new batch every 7—10 days
• First sowing: 45 days before you want lettuce (April 15 for June 1 harvest)
• Subsequent sowings: every 10 days through late May; stop before summer heat

Crops that benefit most from succession planting

Per Cornell Cooperative Extension and Iowa State University Extension:

High-frequency succession (sow every 7—14 days)

Medium-frequency succession (sow every 2—3 weeks)

Single or double succession (sow 2—3 times per season)

Building the schedule: step by step

Per Penn State Extension:

1. List your target crops and how much of each your household uses per week
2. Find days to harvest from seed packets (or extension databases — see Cornell vegetable growing guides)
3. Note your dates: Last spring frost date, first fall frost date, average daily high temperature July 1
4. Calculate sowing windows:

- Spring crops: last frost date minus days to harvest = latest spring start; first tolerable soil temperature = earliest start - Fall crops: first fall frost date minus days to harvest minus 2 weeks (buffer) = latest fall start

1. Set interval: Based on household use and crop harvest window
2. Write out all sowing dates — whether on paper or a spreadsheet

Sample schedule (zone 6, last frost May 1, first frost October 15)

Dates are approximate; adjust by 2 weeks per zone difference

Managing heat and bolt risk

Per NC State Extension, most cool-season crops (lettuce, spinach, arugula) bolt (go to flower) when:

• Day length exceeds 14 hours, AND
• Temperature regularly exceeds 80°F

In zone 6, this typically happens in mid-June. Stop sowing these crops approximately 6 weeks before that date (early May), then resume 8—10 weeks before the first fall frost to ensure harvest before cold.

This creates a "gap" in summer (mid-June to mid-July in zone 6) when cool-season salad crops are not available from the garden. Fill this gap with warm-season alternatives (basil, amaranth greens, New Zealand spinach (Tetragonia), which tolerates heat).

Common problems

Frequently asked questions

How many rows should one succession be? Per Cornell Cooperative Extension, a household of 2—4 people typically needs one 3-foot row of radishes, one 4-foot row of leaf lettuce, and half a 4-foot row of spinach per succession. More than this creates a glut. The goal is to eat everything from one sowing before the next is ready.

Do I need to keep detailed records? Not initially. Per Penn State Extension, even a simple calendar with sow dates written in is enough. The schedule improves each year as you learn which intervals work for your household's actual consumption rate.

Is succession planting practical in a small garden? Yes — in fact it is more necessary. Small gardens have limited space, and the goal is to use every square foot productively all season. Succession planting with small batches is more space-efficient than large single sowings.

How do I handle succession for crops like tomatoes (120 days) that don't really benefit from frequent sowing? Per Iowa State Extension, long-season crops (tomatoes, peppers, winter squash) are not typically succession-planted because the season length doesn't accommodate multiple successions. The focus is on variety selection (early, mid, late) to stagger harvest rather than multiple sowing dates.

Recommended gear: Sweet corn varieties for the home garden — our buyer's guide covering picks for every budget, ranked by Extension publication consensus and personal use.

Sources

1. Cornell Cooperative Extension — Succession planting
2. Penn State Extension — Succession planting
3. Iowa State University Extension — Succession planting
4. NC State Extension — Vegetable succession planting
5. Cornell — Vegetable growing guides