← Garden Guide

Supports & trellises

Vertical growing is Square Foot Gardening's superpower — one vine up a trellis uses a single square instead of sprawling across six. Supports also keep fruit off the soil (cleaner, fewer slugs, less rot), improve airflow, and make harvesting painless. Add supports at planting time, never later — trying to cage a 1 m tomato is a disaster.

Why use supports?

  • Massive space savings — a cucumber on a trellis yields the same as one sprawling across 4–6 squares.
  • Cleaner, healthier fruit — off the ground means no soil splash, fewer slug holes, less fruit rot.
  • Better light and airflow — vertical canopies dry faster after rain, reducing mildew and blight.
  • No bending to harvest — ripe beans, peas and cucumbers at eye level is a back-saver.

    • Materials

    Bamboo canes

    Cheap, light, lasts 3–5 years, easy to cut. Push them 20–30 cm into the soil; lash tops together for tipis. Ideal for peas, beans, young tomatoes.

    Wooden stakes

    2×2 cm to 4×4 cm softwood, 1.5–2 m long. Stronger than bamboo for heavy tomato cordons. Choose untreated wood (FSC spruce, larch, chestnut) — pressure-treated wood can leach into edibles.

    Metal / rebar / galvanised wire

    Rebar (8–10 mm) is indestructible and cheap from builders' merchants. Rusts to a discreet brown in a season. Galvanised cattle-panel (heavy wire mesh) is the gold-standard SFG trellis.

    Twine, soft ties, plant clips

    Jute twine biodegrades (great for annuals, composts with the plant at season's end). Stretchy plant ties or velcro for perennials and woody stems. Avoid thin wire or fishing line — cuts into the stem.

    Support types

    Single stake

    One 1.5–2 m stick per plant, tied to the stem every 20 cm. Best for cordon tomatoes and peppers. Simple, cheap, needs regular tying as the plant grows.

    Tomato cage / ring

    Wire spiral or 3-legged cage. Self-supporting — no tying. Good for determinate tomatoes and peppers. Cheap ones bend under the weight of big indeterminates; buy heavy-duty or make your own from concrete-reinforcing mesh.

    Flat trellis (panel or mesh)

    Vertical mesh, lattice or cattle-panel on the north side of the bed so it doesn't shade neighbours. Perfect for cucumbers, small melons, pole beans, vining squash. Anchor the base firmly — a loaded cucumber vine is heavy and catches the wind.

    Tipi / wigwam

    4–6 canes pushed into a circle and tied at the top. Uses only 1 square foot of floor space but gives climbers 2 m of height. Classic for runner beans and sweet peas; kids love the cave inside.

    Pea & bean netting

    Soft plastic or jute mesh (10×10 cm squares) stretched between two stakes. Peas and climbing beans grab it with their tendrils. Remove and compost at end of season — disentangling spent vines from plastic net is misery.

    String / Florida weave

    Two stakes at the ends of a row, twine zigzagged between stakes and plants at 20 cm intervals. Fast, cheap, perfect for a row of tomatoes or peppers. Classic commercial grower technique that works brilliantly in a 4×4 bed.

    Which crop needs what

    Match the support to the crop — the wrong choice is worse than no support at all.

  • Cordon tomatoes — single stake or string weave, 1.8–2 m tall.
  • Bush tomatoes & peppers — a short cage (60 cm) or two small bamboo canes in a cross.
  • Cucumbers, gherkins, small melons — flat trellis or netting on the north edge, 1.8 m tall.
  • Pole beans & runner beans — tipi, or net between two tall stakes; 2 m minimum.
  • Peas & mangetout — pea netting or bushy twigs (pea sticks), 1–1.5 m tall is plenty.
  • Climbing squash, mini-pumpkins — strong wire mesh trellis; support individual fruits over 500 g in a cloth sling.
  • Raspberries — post-and-wire: two 1.8 m posts, 3 horizontal wires at 60 / 100 / 140 cm.

    • How to tie plants

    A bad tie girdles or snaps the stem. A good tie holds and flexes.

  • Use a figure-of-eight: loop the tie loosely around the stem, cross over, loop tightly around the stake. The stem sits in a cushion, not against the hard support.
  • Never pull tight — leave a finger's width of slack for the stem to thicken.
  • Check and loosen ties every 2–3 weeks in summer — stems fatten fast and tight ties cause permanent damage.
  • Replace ties if you see a groove in the stem. Prevention is easy, a strangled stem breaks at the scar.

    • SFG-specific tips

  • Put tall supports on the north side (northern hemisphere) so they don't shade the rest of the bed.
  • Install supports at planting time. Driving a stake into the bed later spears roots and damages neighbours.
  • A sturdy corner-mounted trellis on a 4×4 bed doubles usable growing space — add it as soon as the frame is built.
  • Recycle & repurpose: old bike wheels, broken rake handles, clothes horses, hazel prunings from a hedge — all make great supports for one season.

    • Anchor depth matters more than thickness. A 25 mm bamboo cane pushed 30 cm into firm soil holds a mature tomato. A 50 mm stake shoved 10 cm deep topples in the first storm. Always go deeper than feels necessary.