Seed Storage

A number of factors are important for successful seed storage:

dry seeds: the lower the humidity, the longer the seeds remain viable. Under no circumstances should seeds be placed in storage whilst damp, as they may then develop mould.
airtight containers: when seeds have minimal contact with air they breathe less and age more slowly.
cool conditions: temperatures between 0°C and 10°C are optimal. It is also important that the storage area is not subject to sudden temperature changes.
darkened storage: seeds are best kept in a dark room or in an airtight container in a box away from light.
dry storage: moist, warm conditions not only initiate germination, they promote the growth of harmful fungi and bacteria.
mouseproofing: seeds must be kept safe from mice and other vermin. The most dangerous pests are flour moths, bean beetles and other insects, mice and rats.
deep freezing is only possible if the seeds have been thoroughly dried, as otherwise they will be damaged. The seeds must be sealed into bags with a metallic lining. When maintained at –18°C they will retain adequate viability for 10 years, with some varieties lasting for 20 years.

airtight containers such as resealable jam jars, bottles with airtight caps and glass jars with O-ring seals (Kilner jars) should be used. Preserve jars with wire closures have proved to be particularly suitable.
Space can be saved by storing several seed packs in a large resealable container.
Wooden boxes, nylon/plastic bags and cardboard boxes are unsuitable, as they are not sufficiently resistent to moisture and pests.