Physiological age is more than time in store
Physiological age describes the state of seed tubers as they progress through dormancy, sprouting and ageing. Equal calendar time in storage does not establish equal physiological condition across varieties or lots.
Seed age can influence emergence, stem number and subsequent crop performance. Variety, environment and crop management also matter; sprout appearance alone cannot establish a yield or processing-quality guarantee.
Review four parts of the planting plan
Variety & lot
Check variety, propagation stage, lot identity and available health records.
Production & storage history
Record harvest and storage dates, temperature changes and any abnormal handling events.
Current condition
Observe sprouts, surface moisture, damage and rot. Appearance does not replace health testing.
Planting window
Define the region, intended planting date, transit time and reception conditions.
Connect reception, storage and planting
Match labels, quantity and specification to the order on arrival. If planting is delayed, agree storage arrangements for the lot and intended planting window. One temperature or duration is not a universal prescription.
Manage temperature transitions and condensation, provide appropriate ventilation and minimise handling damage. Separate suspect material and discuss it before mixing lots.
Make observations comparable
For a new variety or growing region, consider a small-scale observation under local conditions. Record the lot, planting date, tuber size and condition, emergence and field management together.
Keep the comparison conditions consistent. Differences in variety, planting date and management should not be attributed solely to physiological age. Observations inform planning but do not replace batch testing or agreed acceptance criteria.
Prepare the supply discussion
Share the variety, seed generation or propagation stage, quantity, growing region and planting window. Confirm specification, delivery condition and reception requirements in the order.
Technical references
AHDB · Potato agronomy research
AHDB · Seed handling & storage