Xref: kermit rec.gardens:267725

You will find they are very similar in many ways. Effectiveness is
proportional to depth. If any grass does grow through it will be easy enough
to pull out. Tap rooted weeds will push through and will thrive, so remove
them before the mulch. Pine needles tend to be more acidic.
Best Wishes.
"alien" wrote in message
88.18...


Which is better for keeping grass at bay?

Thanks.