Seeds and Propagation
Seed Starting Lead Time Calculator
Seed Starting Lead Time uses its formula to back-calculate a seed-starting day from transplant timing. Its seed-starting day of year output is tied to transplant day of year and indoor growing days.
Enter values for seed-starting day of year
Read each Seed Starting Lead Time field note before calculating seed-starting day of year.
Seed-starting day of year: condition to verify
Add separate germination time if it is not included in growing days.
From transplant day of year to seed-starting day of year
Seed Starting Lead Time finds the difference using Transplant day of year and Indoor growing days.
Transplant day of year at 135 day, indoor growing days at 56 days produces 79 day in the demonstration case.
The decision behind Seed Starting Lead Time
Seed Starting Lead Time focuses on Seed-starting day of year and combines Transplant day of year and Indoor growing days. The calculation for stratification end day remains in Cold Stratification End Calculator.
Use seed-starting day of year to back-calculate a seed-starting day from transplant timing, then inspect transplant day of year in the field.
Input definitions for seed-starting day of year
The Seed Starting Lead Time input panel defines Transplant day of year and Indoor growing days. Note any Seed Starting Lead Time conversion.
- Transplant day of year
- Default in Seed Starting Lead Time: 135 day.
- Indoor growing days
- Default in Seed Starting Lead Time: 56 days.
Using the Seed Starting Lead Time result
The main result is seed-starting day of year. Use identical units when comparing two seed starting lead time scenarios.
Documenting seed-starting day of year
Date the Seed Starting Lead Time case and retain Transplant day of year and Indoor growing days.
Record how transplant day of year was obtained and whether a conversion or estimate was involved.
Use the same seed-starting day of year units for the observed outcome so the comparison remains meaningful.
Seed Starting Lead Time low-and-high comparison
In the Seed Starting Lead Time example, changing Transplant day of year from 135 day to 148.5 day produces 93 day rather than 79 day.
Use transplant day of year only to compare seed-starting day of year.
Pair transplant day of year with Seed Starting Lead Time site observations.
Questions about Seed Starting Lead Time
Should germination and survival be combined in Seed Starting Lead Time?
Combine them only when the formula explicitly names both rates; otherwise keep each loss stage separate.