To Mulch, or not to Mulch?
In the spring when we plant the weather is cool with higher humidity. We usually get some rain, even here in So. Cal.
The common wisdom is to put down a layer of mulch at that time.
We don't need it, but we just do it because we're "supposed to."
Our biggest pest problems, slugs, earwigs and pill bugs, love us for our labor and our consideration of their needs. We provide a haven and breeding ground for them. They'll devour our seedlings as they sprout and give us problems throughout the year.
I've had to take almost no pest control measures at all for the past few years. I don't create that breeding ground in the first place. Later, when the weather warms and the humidity drops, mulching is a good idea for holding moisture in the soil--if I can get to the soil. Most of my plants are so spread out and enormous by then that I can't put down mulch without damaging the plants. I put it where I can, but mostly I can't get to the soil.
Where I used to have an ongoing battle with all my obnoxious little friends, it's now rare to see one. I don't use any more water than I did when I was providing a protective haven for my worst enemies.
Keep your bed surfaces clear of debris and mulch in the early growing season. You'll stop most of your pest problems before they start.