04/08/2026
I do some of this, but not on top of each other like this…interesting 🤔
Most gardeners plant squash alone and spend the summer fighting vine borers, powdery mildew, and squash bugs. The fix isn't spraying. It's planting a ring around the mound that handles all three. 🌿
This is the Three Sisters guild — corn, beans, and squash — with four additional companions that close the gaps the original trio leaves open.
Seven plants. Each one assigned to a specific threat.
Nasturtium at the mound edge acts as a trap crop. Squash bugs prefer nasturtium over zucchini and concentrate there first. Check the undersides of nasturtium leaves for bronze egg clusters and remove them.
Dill near the stems attracts the tiny parasitic wasps that target vine borer eggs before they hatch. Let it bolt — the flat yellow flower heads are the functional part.
Oregano at the base releases volatile oils that suppress powdery mildew spore germination at the leaf surface. Plant it early — this is prevention, not treatment.
Radish between the hills deters squash bugs through root compounds. Ready to harvest in about three weeks, well before the vines need the space.
Marigold ringing the outer border suppresses root-knot nematodes through root compounds and disrupts pest insects searching for squash by scent above ground.
Corn at the back gives the squash vines something to climb, lifting foliage off wet ground and improving airflow through the whole planting. Less surface humidity means less mildew.
Pole beans climbing the corn fix nitrogen through root nodules while the squash and corn are drawing it down. The beans produce fertilizer in real time while the other two crops use it.
Three threats. Seven plants. One mound. The ring does the work all season. 🌱
