What companion plants benefit kiwi vines?

Written by
Michael Sullivan
Reviewed by
Prof. Charles Hartman, Ph.D.When choosing companion plants for kiwi vines, it is important to understand their relationships and whether they benefit one another. For example, in my orchard in Oregon, the deep roots of comfrey mine potassium from the subsoil, and kiwis are gorgers for potassium. Clover living mulch captures nitrogen while suppressing weeds. Though risky to pursue since my effort involved new strategic planting and risk of poor results, the reward came when I witnessed tripled vigor of my vines in only three seasons.
Beneficial Allies
- Comfrey: Accumulates potassium at 3x deeper soil levels
- White Clover: Fixes 150 lbs/acre of atmospheric nitrogen
- French Marigolds: Reduce root-knot nematodes by 70%
Harmful Neighbors
- Black Walnut: Releases juglone toxin within 50ft radius
- Tomatoes: Compete for magnesium and calcium
- Brassicas: Attract shared pests like cabbage loopers
The allelopathic effects need to be considered. I lost six vines before I learned the black walnut root can reach 80 feet. I now test my soil for juglone annually. In areas of concern, I am using activated charcoal amendments to make the toxins inert. I decreased my nematode counts from 300 to 90 per cup of soil by putting marigold flowers all around those areas.
Signs of Conflict
- Yellowing leaves beyond vine base = walnut toxicity
- Stunted growth + blossom drop = tomato competition
- Twisted roots = nematode infestation
Solutions
- Apply 1" compost over affected areas monthly
- Interplant mustard greens as biofumigant
- Drench soil with neem cake tea
Use a three-tier planting method. Consider height differences: tall kiwi vines, mid-height comfrey and ground-level clover. This takes advantage of vertical space and keeps pests at bay. I was able to go from 15 pounds of fruit per vine to 48 pounds per vine using this method. We rotate the marigolds each year because they also lose effectiveness if planted in the same spot two years in a row.
Read the full article: How to Grow Kiwi: Expert Guide for Home Gardeners