Plant Spacing Guide
How far apart to plant everything you grow — in rows, in beds, and in square-foot grids. Cross-referenced against KSU Extension recommendations.
📐 Why Spacing Matters
Crowded plants compete for water, light, and root space — and create the still humid air that fungal diseases love. The right spacing isn't just about yield; it's about disease pressure.
In-row vs. between-row vs. per square foot
In-row: distance between plants within a row. Between-row: distance between adjacent rows — usually wider to allow walking, weeding, and airflow. Per-square-foot: the intensive-bed approach — plants packed in a grid with no walking rows, used in raised beds.
Plant once, then thin
For small seeds (carrots, lettuce, radishes), sow 2–3× thicker than final spacing and thin to the target after germination. It's the only way to guarantee a stand — germination rates are rarely 100%, and thinned seedlings make great salad greens.
Airflow is non-negotiable in KC
Kansas City humidity makes powdery mildew, early blight, and septoria leaf spot constant threats. Err on the wider side of any spacing range — especially for tomatoes, squash, basil, and zinnias. The "you can squeeze one more in" instinct will cost you the crop.
🥦 Vegetables
Standard row spacing plus square-foot grid count. Tap a row to focus on it.
| Crop | In-Row | Between Rows | Per Sq Ft | Seed Depth |
|---|---|---|---|---|
| Tomato ☀️ Warm | 24–36" | 48" | 4 | 2" deeper than pot |
| Pepper ☀️ Warm | 18" | 24" | 1 | Same as pot |
| Eggplant ☀️ Warm | 18–24" | 30" | 2 | Same as pot |
| Broccoli 🌸 Cool | 18" | 24" | 1 | 1/4" |
| Lettuce 🌸 Cool | 8–12" | 12" | 4 | 1/8" |
| Spinach 🌸 Cool | 3–6" | 12" | 9 | 1/2" |
| Kale 🌸 Cool | 12–18" | 24" | 1 | 1/4" |
| Cucumber ☀️ Warm | 12" | 48" trellised | 1 | 1/2–1" |
| Zucchini / Summer Squash ☀️ Warm | 24–36" | 48" | 4 | 1" |
| Green Bean ☀️ Warm | 4–6" | 24" | 9 | 1" |
| Carrot 🌸 Cool | 2–3" | 12" | 16 | 1/4" |
| Radish 🌸 Cool | 2" | 6" | 16 | 1/2" |
| Onion 🌸 Cool | 4–6" | 12" | 4 | 1" |
| Garlic 🌸 Cool | 6" | 12" | 4 | 2–3" |
| Sweet Corn ☀️ Warm | 9–12" | 30" | 4 | 1–2" |
| Potato 🌸 Cool | 12" | 36" | 1 | 4" then hill |
| Swiss Chard 🌸 Cool | 6–12" | 18" | 4 | 1/2" |
| Brussels Sprouts 🌸 Cool | 24" | 30" | 2 | 1/4" |
| Celery 🌸 Cool | 8–10" | 24" | 4 | Surface (needs light) |
🌿 Herbs
Most herbs are happiest in raised beds or large containers. Perennial herbs (oregano, thyme, mint, sage) need a bit more room — they fill in over the seasons.
| Herb | In-Row | Between Rows | Per Sq Ft | Seed Depth |
|---|---|---|---|---|
| Basil | 12–18" | — | 1 | 1/4" |
| Cilantro / Coriander | 4–6" | — | 16 | 1/4" |
| Dill | 6–9" | — | 4 | 1/8" |
| Parsley | 6–8" | — | 4 | 1/4" |
| Summer Savory | 6–10" | — | 4 | 1/8" |
| German Chamomile | 4–6" | — | 9 | Surface sow |
| Borage | 12–18" | — | 1 | 1/4" |
| Holy Basil / Tulsi | 12–18" | — | 1 | 1/8" |
| Stevia | 18" | — | 1 | Surface sow |
| Chervil | 6" | — | 9 | 1/4" |
| Chives | 6–9" | — | 4 | 1/4" |
| Oregano | 12–18" | — | 1 | 1/8" |
| Thyme | 9–12" | — | 2 | 1/8" |
| Mint | Contained | — | 1 | Surface |
| Sage | 18–24" | — | 1 | 1/4" |
| Rosemary | 24–36" | — | 1 | — |
| Lavender | 24" | — | 1 | — |
| Lemon Balm | 18–24" | — | 1 | Surface sow |
| French Tarragon | 18–24" | — | 1 | — |
| Bee Balm | 18–24" | — | 1 | — |
| Echinacea | 18–24" | — | 1 | 1/4" |
| Lovage | 24–36" | — | 1 | 1/4" |
| Winter Savory | 12–15" | — | 1 | 1/8" |
🌶️ Exotics & Specialty Crops
Same spacing logic as standard vegetables, but watch the slow-starters — they need their full season to size up. Don't crowd them out with quick-growing neighbors.
| Crop | In-Row | Between Rows | Per Sq Ft | Seed Depth |
|---|---|---|---|---|
| Tomatillo ☀️ Warm | 24–36" | 48" | 4 | Same as pot |
| Ground Cherry ☀️ Warm | 24" | 36" | 2 | Same as pot |
| Okra ☀️ Warm | 12–18" | 24" | 1 | 1/2–1" |
| Sweet Potato ☀️ Warm | 12–18" | 48" | 1 | Slip planting |
| Watermelon ☀️ Warm | 36" | 72" | 4 | 1" |
| Winter Squash / Pumpkin ☀️ Warm | 36" | 72" | 9 | 1" |
| Edamame ☀️ Warm | 4–6" | 18" | 9 | 1" |
| Lemongrass ☀️ Warm | 24–36" | 36" | 4 | Same as pot |
| Kohlrabi 🌸 Cool | 5–6" | 12" | 2 | 1/4" |
| Bok Choy 🌸 Cool | 6–12" | 18" | 1 | 1/4" |
| Arugula 🌸 Cool | 4–6" | 12" | 3 | 1/4" |
| Radicchio 🌸 Cool | 8–10" | 18" | 1 | 1/4" |
| Artichoke 🐢 Slow | 36–48" | 48" | 12 | Same as pot |
| Celeriac 🐢 Slow | 8–12" | 18" | 1 | Surface sow — needs light |
| Ginger 🐢 Slow | 12" | 18" | 1 | 2" |
🍎 Fruit Trees
Rootstock determines mature size — and therefore spacing. For most KC backyard gardens, semi-dwarf is the sweet spot: manageable harvest height, but still long-lived and productive. Spacing is given as between trees of the same type; mixed plantings can go a bit closer.
🍎 Apple
Needs 2+ varieties within 100 ft for cross-pollination. Standard apples become 20–30 ft trees and are rarely the right call for a city lot.
🍐 Pear
Most pears need a second variety for pollination — Kieffer and Bartlett pair well. Fire-blight-resistant varieties only in KC.
🍑 Peach & Nectarine
Self-fertile — one tree gives fruit. Choose cold-hardy varieties (Reliance, Contender) for Zone 6a — most peaches bloom too early for our late-March freezes.
🍒 Cherry (Sour & Sweet)
Sour cherries (Montmorency, North Star) are self-fertile and far more reliable in KC. Sweet cherries need two compatible varieties and are tougher to keep alive.
🫐 Plum
Japanese plums need a second Japanese variety; European plums (Stanley, Mount Royal) are largely self-fertile.
🌿 Fig
Self-fertile. Marginally hardy in Zone 6a — Chicago Hardy survives to ~-20°F if wrapped. Container culture is the easier path.
🍓 Berries & Brambles
Berry spacing is about light and air — crowded canes mean disease and small fruit. KSU Extension recommendations below.
🫐 Blueberry
Plant 2+ varieties for cross-pollination. KC soil is far too alkaline — heavy peat moss / pine bark amendments required, and re-acidify every spring.
🍓 Strawberry
June-bearing varieties run lots of daughter plants — start wide and let them fill in. Everbearing types stay closer to original spacing.
🍇 Grape
American grapes (Concord, Niagara) are by far the most reliable in KC. Vinifera (wine grapes) struggle here without serious disease management.
🍓 Raspberry
Fall-bearing types (Heritage, Caroline) — cut all canes to the ground each winter. Trellis or T-post the row to keep it from sprawling.
🖤 Blackberry
Thornless varieties (Triple Crown, Chester, Natchez) are strongly recommended for backyard growers. Remove floricanes after fruiting.
📏 Square-Foot Quick Reference
For raised beds and intensive plantings: how many plants per 12×12 inch grid square.
🌽 KC-Specific Spacing Notes
Things our climate and soil change about the standard advice.
Tomatoes need extra room here
Use the wide end of the spacing range — 36" between indeterminate plants minimum. Our July humidity drives early blight and septoria fast in crowded plantings. Caged tomatoes can be closer than staked.
Squash vines wander further than the chart says
Winter squash and pumpkins listed at 36" really need 48–60" in open ground. Vines roam 8–12 ft. Either commit the space, trellis them, or pick bush varieties (which are still rare).
Cool-season crops get crowded earlier
Spring heat arrives fast in KC. Plant cool-season crops (lettuce, spinach, peas) at the tighter end of their range — they'll be done by the time crowding matters, and you'll get more before bolt.
Native clay soil = wider spacing
Plants grown in unamended KC clay grow smaller root systems and smaller above-ground biomass. That sounds like you can crowd them more, but the opposite is true — they're stressed enough already without competition. Either amend heavily or give them extra room.