Mulching basics

Depth, timing and technique for healthy beds and trees.

How Deep Should Mulch Be?Mulching basics
Experts recommend 2-4 inches of mulch. Learn the right depth for beds and trees, the 3-3-3 rule and how to avoid mulch volcanoes.
When Should You Mulch?Mulching basics
Spring or fall? When to mulch beds, when to add winter mulch (when the ground is about to freeze) and a simple mulching calendar, with extension sources.
Using Grass Clippings as MulchMulching basics
Can you use grass clippings as mulch? Yes: apply thin layers up to 1/4 inch, let each dry, and never use clippings from lawns treated with herbicide in the past month.
How to Use Cardboard as Mulch (Sheet Mulching)Mulching basics
How to use cardboard as mulch: plain brown corrugated cardboard, tape removed, 4-6 wet overlapping layers, topped with compost and mulch. Steps from OSU Extension.
Straw Mulch for the Vegetable GardenMulching basics
How to use straw mulch in a vegetable garden: 3-4 inches deep, weed-free straw only, watch for herbicide carryover, and how much straw you need per bed.