mollwollfumble said:
Apologies for non-science thread.
In both of these want best weed control and maximum durability. Not wanting increased soil fertility.
1. Best bulk weed control surface layer (mulch or pebbles)? Which are worst? Best depth? This is to go over the top of weedmat, so could be thinner than mulch alone.
Nearest landscaper offers a choice of dozens –
Softfall mulch (Intended for playgrounds)
Blackwood Mulch
Pinebark Mulch
Redwood Mulch
Terra Cotta Chips
Redgum Chips
Euca Mulch
2-5 mm grit
7 mm Multi-pebbles
10 mm Causeway Pebbles
14 mm Quartz
10-14 mm Ice (Limestone pebbles)
20 mm Natural Charm Pebbles
Or better to mix them – eg. pebbles near trees to stop rot and mulch further away?
2. Best garden edging? Have seen failures of many types of garden edging, want long-lasting. How to fix so that they never topple over?
Brick – double thickness?
Sleepers – treated pine, redgum or railway? 50 mm thick?
Concrete slabs (have some at the moment – keep breaking and toppling over.)
I like to use sugar cane mulch. cheap , works well but you do need to top up from time to time. I mean years later to top up btw.
The biggest thing with mulching is fix the weed issue and then mulch if you have an ongoing issues with significant weeds. Some people do not like round up but you can spray round up wait the recommended period of time and put the mulch on and start afresh that way. Quicker , less labour intensive and should work.
Some things to consider when putting in borders, is to understand the slopes of your yards. You could potentially create a dam and a flooding issue if storm water cannot flow away from the property.
Treated H4 and similar timber won’t be affected by termites and borers but some of the chemicals will leach into the soils over periods of time. If you have an edible garden in the future works, this may be a risk to consider pre-empting.
Using just sleepers can lead to termite issues because , water , timber and soil contact is what can encourage this type of infestation easily.
concrete is good but if you have a lot of land movement the concrete can lift and separate.
Brick could be decorative too. If there is a lot of water flow thought it might be worthwhile putting in gravel and ag pipe to ensure water doesn’t push over the bricks later.
I think with borders the depth makes a difference as grasses can grow under the borders.
HTH.