bulb ring suppresses turfgrass competition at the stem
Mechanism: Resource competition and physical occupancy of the root collar zone.
Evidence: settled without a trial - competition.
Kiwi Arbour
A perennial guild - a standing planting, not lifted between seasons.
The grape arbour's twin (O132 team 5, adopted 2026-09-02): the ring pattern around a trellised vine, with hardy kiwi's pair floor and structure from Penn State, Oregon State, Minnesota, Wisconsin and NC State, read 2026-09-02.
What binds this planting
The corpus partly backs this planting with 2 graded mechanisms its members share:
- Narcissus deters voles and rodents.
- A bulb ring suppresses turfgrass competition at the base of a woody perennial shrub or vine.
Space it needs
At least 9 m²96.9 ft². A bed smaller than that does not get this guild quietly substituted for something else — the planner greys it out, says why, and offers the nearest adaptation that does fit.
What it looks like planted
- 1 × hardy kiwi
- 50 × daffodil
Between seasons
The guild is the standing planting; it is not lifted at all.
What it claims
The honest version
The vine is dioecious, so this arbour holds two vines, a male and a female of the same species, and a lone vine or two females sets no fruit; one male serves up to six females if you plant more. It is far heavier than a grapevine, up to 40 lb of fruit on a vine that can grow 30 ft in a year, so the structure is a stout arbour or T-bar on 4 to 6 inch posts, not a grape trellis. The understory stays a bulb ring at the posts because the canopy casts shade.
Roles
A role is filled by whatever satisfies its predicate, not by a fixed species list. The canonical filler is the default; the alternatives are priced.
Canopy
- Canonical: Hardy Kiwi
Support
- Canonical: Cattle Panel
Bulb ring
Rules that gate it
Perennial woody guilds are not bed-scoped. Their ground entity is the drip-line ring.
Mechanism: A tree's root zone expands for a decade and extends well past the canopy edge.
Evidence: settled without a trial - root architecture.
Do not plant a juglone-sensitive species within the root zone of Juglans. The sensitive list is the hazard's own, and it is wider than the nightshades - it also carries apple and cabbage.
Mechanism: Juglans roots exude hydrojuglone, oxidized to juglone, a respiration inhibitor. nightshades are highly sensitive: wilt and death.
Evidence: confirmed against 2 sources in the research-based literature.
the 2 sources
UW-Madison / Wisconsin Horticulture (Joy, Hudelson & Jull, rev. 2024-02-28), 'Black Walnut Toxicity', hort.extension.wisc.edu/articles/black-walnut-toxicity (read 2026-07-13): 'Vegetables such as tomato, potato, eggplant and pepper ... are particularly sensitive to juglone'; 'The toxic effects of a mature black walnut tree can extend 50 to 80 feet from the trunk of the tree, with the greatest toxicity occurring within the tree's dripline.'
Iowa State Univ. Extension & Outreach, Yard and Garden FAQ, 'What plants are sensitive to the juglone produced by black walnuts?', yardandgarden.extension.iastate.edu (read 2026-07-13): juglone-sensitive plants include 'members of the tomato family (tomato, potato, eggplant, pepper).'
remedy
Plant it outside the walnut's root zone — the whole drip line and beyond. There is no soil treatment for juglone.
Dioecious species need both a male and a female plant to set fruit.
Mechanism: A dioecious species carries male and female flowers on separate plants: some plants make only pollen, others only fruit. A lone plant, or a planting that is all one sex, sets no fruit at all, because there is no pollen to reach the female flowers. Fruit needs at least one male plant near the fruiting females. This is a different mechanism from the single-locus self-incompatibility of apple and pear - there a plant has both sexes and rejects only its own pollen; here whole plants are one sex - so it is a separate rule, not a widening of that one.
Evidence: confirmed against 1 source in the research-based literature.
the source
NC State Extension Gardener Plant Toolbox, 'Actinidia arguta', plants.ces.ncsu.edu/plants/actinidia-arguta/ (fetched in-container 2026-08-31; READ BY THE MAINTAINER 2026-09-01): 'A male and female plant is needed for fruit production' - the dioecy this rule fires on - with the self-fertile exceptions named on the same page ('Issai': 'Self-pollinating, lower growing cultivar'; 'Chang Bai Giant': 'May fruit without male, more abundant fruit when male present'), and named male pollinizers ('Ken's Red': 'Male, used as pollinator'; 'Meader': 'Male pollinizer...'). [read]
remedy
Plant at least one male alongside the female fruiting plant(s) - a single plant, or several of the same sex, will never fruit. A few named cultivars are self-fertile and need no separate male; if you grow one of those, one plant is enough.