I have prunus pits that I stratify in a refrigerator during winter.
Normally, the seeds germinate in springtime, which is ideal.
However, often some of the seeds germinate prematurely. When this happens, it's necessary to grow the seeds/plants indoors during winter until they can be planted outdoors (after the last frost date). This is not ideal.
Rather than let the premature pits grow, an alternative would be to slow germination down (or even prevent it) by keeping them at just above freezing. It's my understanding that the colder plants are, the slower they grow (up until freezing, of course--the plants are too young to go dormant for sub-zero temperatures).
So, the question becomes, "Where in my house is the temperature at just above freezing?".
Typically, refrigerators are at a temperature of around 6°C. From experience, I've found that 6°C is too high; the plants grow and eventually die due to lack of light.
How can I store the seeds at 1°C in a household setting?