Vegetable Plant Spacing Guide – How Far Apart to Plant Everything
Plant spacing is one of the most commonly ignored instructions in vegetable gardening – and one of the most consequential. Too close and plants compete for light, water and nutrients, producing weaker harvests and more disease. Too far and you waste growing space and leave soil exposed for weeds. Getting it right is simpler than it sounds.
Why spacing matters
Every plant has a root zone and a canopy that defines how much space it actually needs. When plants are too close together:
- Root systems compete for water and nutrients – both suffer
- Canopies overlap and reduce airflow, which creates humid conditions where fungal diseases thrive
- Taller plants shade shorter neighbours, reducing photosynthesis and yield
- Access for harvesting and maintenance becomes difficult
When plants are correctly spaced, the leaf canopy closes over just as the plants mature – shading the soil, suppressing weeds and retaining moisture, without crowding the plants themselves.
Row spacing vs raised bed spacing
Traditional row gardening uses two measurements: in-row spacing (between plants in the same row) and row spacing (between rows). Row spacing is usually much wider than in-row spacing because it accounts for machinery, human access and the way rows are managed.
In raised bed gardening, you don't need row access – you reach in from the side. This means you can use equidistant spacing: the same distance in all directions, forming a grid or offset triangular pattern. Raised bed spacing is typically 20–30% closer than traditional row spacing.
Complete vegetable spacing reference
The table below gives practical spacing for home gardens. "Raised bed" spacing assumes good soil, no row access needed. "Traditional rows" assumes standard plot gardening.
| Vegetable | Raised bed spacing | Row / in-row spacing | Notes |
|---|---|---|---|
| Tomato (cordon) | 50–60 cm | 45–60 cm / 90 cm rows | Needs support stake or cage |
| Tomato (bush) | 45 cm | 45 cm / 75 cm rows | No pruning needed |
| Courgette / Zucchini | 90 cm | 90 cm / 90 cm rows | Large spreader – give it room |
| Cucumber | 45 cm | 45 cm / 90 cm rows | Train vertically to save space |
| Pepper / Capsicum | 35–45 cm | 35–45 cm / 60 cm rows | Can grow closer in containers |
| Carrot | 8–10 cm | 5–8 cm / 30 cm rows | Thin after germination |
| Beetroot | 10–12 cm | 8–10 cm / 30 cm rows | Each "seed" is a cluster – thin to 1 |
| Parsnip | 15 cm | 10–15 cm / 30 cm rows | Needs deep, loose soil |
| Onion (sets) | 10 cm | 10 cm / 25–30 cm rows | Plant with tip just below surface |
| Garlic | 15 cm | 15 cm / 30 cm rows | Plant individual cloves pointed-side up |
| Leek | 15 cm | 15 cm / 30 cm rows | Transplant deeply for blanched stems |
| Lettuce (loose-leaf) | 20–25 cm | 20–25 cm / 30 cm rows | Harvest outer leaves continuously |
| Lettuce (hearting) | 25–30 cm | 25–30 cm / 30 cm rows | Needs more space to form heart |
| Spinach | 15 cm | 10–15 cm / 30 cm rows | Succession sow every 3–4 weeks |
| Kale | 45–60 cm | 45 cm / 60 cm rows | Large plant, harvest outer leaves |
| Cabbage | 45 cm | 45 cm / 60 cm rows | Varies by variety – check packet |
| Broccoli | 45 cm | 45 cm / 60 cm rows | Produces side shoots after main head |
| Bush beans (French) | 15 cm | 10–15 cm / 45 cm rows | Direct sow after last frost |
| Runner / Climbing beans | 20–25 cm | 20–25 cm / 60 cm rows | Need a cane or string structure |
| Peas | 8–10 cm | 5–8 cm / 60–90 cm rows | Row width accounts for supporting frame |
| Broad beans | 20–25 cm | 20–25 cm / 45–60 cm rows | Double row for wind stability |
| Potato | 30–35 cm | 30–35 cm / 60–75 cm rows | Earth up as they grow |
| Sweetcorn | 30–35 cm | 30–35 cm / 60–75 cm rows | Grow in a block for wind pollination |
| Radish | 5–8 cm | 2–5 cm / 15–20 cm rows | Quick-growing gap filler |
The consequences of planting too close
It's tempting to squeeze more plants into a small space – the seed packet looks so small and the bed looks so big in spring. By July, the picture changes:
- Fungal disease spreads faster. Botrytis, powdery mildew and blight all thrive in stagnant, humid air. Crowded plants create exactly that condition.
- Yields drop. Each plant produces less because it's competing for resources rather than directing energy into fruit or root development.
- Harvesting becomes difficult. You can't see what's ripe, can't reach it without damaging other plants, and often miss produce until it's over-mature.
- Smaller fruit and roots. A crowded carrot produces a small, forked root. A crowded tomato produces smaller fruit, often with poor flavour.
When you can plant closer: succession planting
One legitimate way to use space more efficiently is succession planting – planting faster-maturing crops in between slower ones, harvesting the fast crop before the slow one needs the space. Classic combinations:
- Radishes between carrot rows – radishes are harvested in 4 weeks, before carrots fill out
- Lettuce between brassica transplants – lettuce is cut before the cabbage spreads
- Spinach under sweetcorn – spinach tolerates partial shade once corn grows tall
This works when you plan it deliberately. Random cramming just creates crowding problems.
Using a garden planner to get spacing right
Calculating how many plants fit in a given bed – and whether they'll all have enough space – is exactly the kind of calculation that's tedious by hand and instant with a tool. Gardener Planner places plants on your garden layout to scale, checking spacing automatically and showing you how many fit in each bed. You see the final layout before anything goes in the ground.
It also flags companion planting combinations and helps you plan crop rotation across seasons – so spacing is just one piece of a broader planting plan.
Thinning: the hardest skill in vegetable gardening
Many vegetables are sown closer than their final spacing and then thinned as they grow. Thinning feels wasteful – you're removing healthy seedlings – but it's essential. A row of carrots sown at 1 cm apart must be thinned to 8 cm apart or none of the carrots will size up properly. Don't skip the thinning stage.
Visualise spacing before you plant
Gardener Planner places plants to scale on your garden layout and checks spacing automatically. See exactly how many plants fit and where – before you sow a single seed.
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