Very cool:

Companion Planting Guide

by Peter Dilley July 30, 2010

IDEP’s Companion Planting Guide
Click here for full PDF

Sometimes you end up wishing you had a resource at hand to make it easier to apply Permaculture principles. This was the case for myself when it came time to start thinking about beneficial groupings of plants and those groupings that do not go well together.
This is what I often find lacking with the current publications on offer from PRI and from those in the community. There is a lot of good knowledge locked up that could benefit so many of us in applying permaculture principles.
A simple A3 or A4 information sheet or booklet of a small number of pages is easy to mentally digest and take in and very handy to have as a reference, either printed out and hung up on the wall or on the computer when we sit down and start thinking about designing our gardens or food systems.

Very cool.  We’ll be planting a lot more basil, especially in between mustard.  Aphids love mustard, but I’ve never seen one on a basil leaf.