I am interested to hear people's thoughts about what mulch is best. Whilst I imagine the answer will generally be "depends on the circumstances", I am particularly interested to know where gravel mulch might be best and where it would be bad. I have had several conversations with fellow designers in Melbourne who would NEVER consider gravel for mulch as they believe it will transmit excessive heat to the soil and increase evaporation.
I have tried gravel mulch myself years ago and foolishly used a 14-20mm size. I think a pea gravel - say 7mm - might be preferable. The larger gravel drives me mad to this day - it is so difficult to garden in - can't easily dig plants out or dig new holes to pop new plants.
A further question is which organic mulch is best?
I am most interested in people's thoughts and experiences around this topic.