have you had a look at aus.gardens? they're a nice group (a bit quiet).
glyophosphate (e.g. roundup, zero) works if you must poison them. look on
the instructions, but generally for trees & such you need to cut it to a
stump, & then paint the stuff onto the raw top. sometimes you have to
re-apply once or twice it i think, and you use a stronger solution than you
would for weeds.
might be worth asking a gardening group, though - i do most things in the
garden without chemicals & zero is the only one i know! i did, however, use
it to very good effect to get rid of years' worth of weeds, & the kind i
have (it comes in various concentrations for you to dilute further, all the
instructions are there) can certainly be used for trees if one is so
If you keep cutting off the foliage, plants will be dead before
long. I even go after poison ivy and poison oak that way, with
hand tools and a string trimmer. With poison, I'd have to spray at
the right time, then wait to see if it worked.
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