This is the key information that I've gleaned so far...
- Black mulberry seeds are best planted as soon as they've been removed from the berry.
- All of the fruit should be cleaned from the seeds to prevent moulds forming.
- Seeds should be planted below 1mm of compost in a warm propogator and kept moist.
- Seedlings have very fragile roots so shouldn't be handled too much.
- Whilst the tree can survive outside, small seedlings should be brought inside or under glass during winter.
- Mulberry trees drop their leaves at the first sign of frost, spending much of their time in a dormant state. Sometimes the dormant seedlings don't 'wake up', andt if a tree is still dormant by summer then it's unlikely to come out of dormancy. There is a solution... chopping off the top of the seedling and any existing leaves sends it into shock which encourages it to put out new leaves.
- After a year or two the mulberry can be transplanted to their proposed location.