Formula used
Planting date: first planting plus round number times interval. Each selected method changes the interval rule. Frost and deadline limits can shorten the schedule.
Harvest start: field planting date plus maturity and weather delay. Indoor starts use the calculated transplant date. Harvest end adds the expected harvest duration.
Seeds required: target plants divided by expected survival rate. Survival combines germination and loss percentages. Packet count rounds upward to whole packets.
Bed capacity: usable bed area divided by spacing area. Results are planning estimates, not guaranteed yields. Local weather and varieties can change outcomes.
How to use
- Select a crop preset or enter a custom crop.
- Enter frost dates and your planting limits.
- Choose a succession method and desired interval.
- Add growing conditions, bed dimensions, and spacing.
- Set germination, loss, and seed packet values.
- Calculate, review warnings, then export the schedule.
Example planting data
| Crop | Typical maturity | Suggested interval | Harvest duration | Common method |
|---|---|---|---|---|
| Radish | 28 days | 7–10 days | 7 days | Direct sow |
| Lettuce | 45 days | 10–14 days | 14 days | Direct or transplant |
| Spinach | 40 days | 14 days | 12 days | Direct sow |
| Beans | 55 days | 14–21 days | 21 days | Direct sow |
| Broccoli | 75 days | 21–28 days | 21 days | Transplant |
Frequently asked questions
What is succession planting?
It means repeating plantings for a longer harvest season. The technique reduces large single harvests. It also improves garden space use.
Which crops suit succession planting?
Fast crops work especially well. Lettuce, radish, spinach, beans, and herbs are common choices. Longer crops can use relay planting.
How often should I sow?
Use crop growth speed and harvest goals. Fast crops often need weekly sowings. Slower crops may use three-week intervals.
Does maturity start at sowing?
Seed packets define maturity differently. Transplanted crops often count from transplanting. Check the variety instructions first.
How are frost dates used?
The calculator limits late outdoor planting. It allows a safety buffer before frost. Season protection can extend the limit.
What does relay planting mean?
A new crop begins before another finishes. Their growing periods overlap briefly. This keeps beds productive longer.
Why are extra seeds recommended?
Not every seed germinates successfully. Some seedlings also fail after emergence. The loss allowance covers both risks.
Can I plan greenhouse crops?
Yes, choose greenhouse as the environment. Frost limits then become less restrictive. Heating and light still affect growth.
Can several crops share one plan?
Yes, use the additional crop section. Enter one formatted line per crop. The results include a combined schedule.
How accurate is bed capacity?
Capacity uses rectangular spacing estimates. Paths and irregular layouts reduce usable space. Always allow practical working room.
Can I export calendar dates?
Yes, the calendar button creates an ICS file. Import it into common calendar applications. CSV and print exports are included.
Gardening disclaimer
This calculator provides planning estimates only. Local soil, weather, pests, and varieties affect actual results. Confirm recommendations with regional growing guidance.