At least 9 m²97 ft². If your bed is smaller, the planner grays this plant team out, says why, and offers the nearest adaptation that fits. It never swaps in something else without telling you.
What it looks like planted
1 × Hardy kiwi
50 × Daffodil
The real placement. The drip-line rings need about 12 ft across, and the planner draws the same layout.
Between seasons
The whole planting stays in place year-round.
What it claims
Bulb ring suppresses turfgrass competition at the stem
Mulch generously to keep the roots cool and moist, build soil organic matter, and discourage weeds.
What to keep in mind
The vine is dioecious, so this arbor 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 arbor or T-bar on 4 to 6 inch posts. A grape trellis won't hold it. The understory stays a bulb ring at the posts because the canopy casts shade.
Who does what, and the swaps
Each job in this planting can be done by more than one plant. The usual choice comes first, and each swap says what it costs.
If you skip this, you lose real yield. The planner warns you.
How it works: 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 and does not widen that one.
Evidence: checked against 1 source in the research-based literature.
A male and female plant is needed for fruit production
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.
The grape arbour's twin: 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.
