In message , Janet Baraclough
writes
The message
from "dave or stella @ stejonda"
contains these words:

We have a sycamore nearby

We also have several Clematis montanas around

Why the difference?

Every seed is pre-programmed to germinate in specific conditions.
Some can only germinate in bare soil; or after fire, or after a frost,
or in light sunny conditions. Clematis are fussier than sycamore.

Sycamore can germinate anywhere, in shallow or deep soil, in shade
or sun,, in wet or dry soil, in bare soil or dense growth of a
competeing plant (such as lawn).

Ok thanks (and to Nick

d
--
dave or stella @ stejonda