After maceration, the entire mass of pulp, skin and berries may be sown, but extraction of the seed makes the whole process more exact. It also releases the seed from the inhibiting effects of the pigments contained within the pulp and skin.
- Vigorous washing of the damp mass with water hose pressure and stirring causes the pulp and skin to rise to the top, after which it can be poured off.
- The viable seed, being heavier, will sink to the bottom and can easily be separated.
- Discard seeds that float, which are infertile (this float test is also a good check for the viability of hazel nuts).
Note: Extraction is particularly beneficial for rowan, but hawthorn and holly also benefit, although these are still slow to germinate, needing two to three seasons.