Gardens Using river boulders
HAVE been advised against using river boulders in my pond. Why is
boulders and a number of other rocks - certainly cement - leach
minerals into the water which can encourage the growth of blanketweed.
However, the problem
tends to ease over time and you can counteract it with additives
such as Pond Balance.
It is also possible
to seal the stones with a clear silicone sealant. This can reduce
the problem considerably.
Gardener, Issue 89, 2002, Page 20
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.