Space is the real constraint in most home gardens. Not seed money, not time, not even water - space. A suburban backyard bed is 32 square feet if you’re lucky. A balcony setup might be 10. Every square foot you give to corn is a square foot you can’t give to basil, and that trade-off matters more than most people realize when they’re flipping through a seed catalog in January.
ROI multiple - the ratio of value produced to money spent - is a useful metric for evaluating a crop’s efficiency on your wallet. But it’s the wrong metric for planning a small garden. A crop can deliver a 10x ROI multiple and still be a poor use of limited space if it spreads out, grows slowly, or produces a low-value harvest per unit area. Corn is the textbook example. At roughly 0.5 lb per stalk (two ears, about 4 oz each) and $1.50/lb retail (USDA AMS Specialty Crop Market News), you’re looking at $0.75 gross per square foot. After seed cost, you’re at $0.70 net. That’s not terrible by itself. But corn also needs a block planting of at least 16 stalks for wind pollination, so you’re committing 16 square feet minimum before you see a single cob. Compare that to basil, which produces $4.00 of net value per square foot from a single plant in the same footprint. The corn is growing while you’re doing the math wrong.
Value per square foot - net dollars of grocery value produced per square foot occupied per season - is the number that actually guides intelligent small-garden planning. This article ranks 20+ crops on that metric, shows how succession planting multiplies the best performers, and builds a specific 4x8 bed plan around the top numbers.
How the Numbers Were Built
Yield figures come from extension publications - primarily Penn State Extension, Cornell Cooperative Extension, and UC Davis ANR guides for each crop. Retail prices are from USDA AMS Specialty Crop Market News terminal market reports (averaged across mid-season 2025 data). Start cost per square foot includes seed or transplant cost amortized across realistic plant spacing, with no labor cost included - that’s a separate analysis.
Gross value per square foot = (yield per plant in lbs x price per lb) / spacing in sq ft. Net value per square foot = gross value - start cost per square foot.
These are single-planting figures. The succession section below shows what happens when you stack multiple plantings per season in the same bed space.
The Master Ranking: 20+ Crops by Net Value Per Square Foot
| Crop | Spacing (sq ft/plant) | Yield/plant (lb) | Price/lb | Gross $/sq ft | Start cost/sq ft | Net $/sq ft |
|---|---|---|---|---|---|---|
| Basil | 1.0 | 0.50 | $14.99 | $7.50 | $3.50 | $4.00 |
| Kale | 2.0 | 5.50 | $3.00 | $8.25 | $1.50 | $3.38 |
| Garlic | 0.17 (6” spacing) | 0.50 | $8.00 | $2.35 | $0.35 | $2.00 |
| Cherry tomato | 4.0 | 10.00 | $6.00 | $2.50 | $1.00 | $1.50 |
| Arugula | 0.25 (broadcast) | 0.30/sq ft | $6.00 | $1.80 | $0.25 | $1.55 |
| Cilantro | 0.25 (broadcast) | 0.375/sq ft | $6.00 | $2.25 | $0.50 | $1.75 |
| Lettuce (leaf) | 0.50 | 0.50 | $3.00 | $1.50 | $0.25 | $1.25 |
| Snap pea | 0.17 (6” spacing) | 0.60 | $4.00 | $1.41 | $0.15 | $1.26 |
| Dill | 0.25 | 0.50 | $5.50 | $1.38 | $0.50 | $0.88 |
| Beet | 0.11 (4” spacing) | 0.40 | $2.50 | $0.91 | $0.15 | $0.76 |
| Green bean (bush) | 0.17 (6” spacing) | 0.40 | $3.00 | $0.71 | $0.05 | $0.66 |
| Spinach | 0.25 | 0.20 | $4.00 | $0.80 | $0.25 | $0.55 |
| Corn | 1.0 | 0.50 | $1.50 | $0.75 | $0.05 | $0.70 |
| Bell pepper | 2.0 | 4.00 | $3.00 | $0.60 | $1.25 | - |
| Slicer tomato | 4.0 | 6.00 | $4.00 | $0.60 | $1.00 | - |
| Cucumber | 4.0 | 5.00 | $2.00 | $0.25 gross | $0.75 | - |
| Winter squash | 12.0 | 8.00 | $1.50 | $1.00 | $0.50 | $0.08 |
| Watermelon | 16.0 | 12.00 | $1.00 | $0.75 | $0.05 | $0.69 |
| Pumpkin | 16.0 | 10.00 | $1.00 | $0.63 | $0.05 | $0.56 |
| Chives | 1.0 (clump) | 0.25 | $8.00 | $2.00 | $2.49 | -$0.49 yr 1 |
A few notes on the table before moving on.
Chives show negative net value in year one because you’re buying a transplant or established clump. From year two onward - since chives are a perennial that comes back reliably in USDA Hardiness Zones 3-10 - the start cost drops to essentially zero and the net/sq ft approaches $2.00. If you already have a clump, it’s a strong performer.
Bell pepper and slicer tomato both show roughly $0.60 gross per square foot. After transplant cost (typically $3.00-4.00 per plant, so $1.25-1.50 per square foot at 2-4 sq ft/plant), many gardeners end up in marginally positive or breakeven territory on these crops. They’re not bad crops. They’re just space-expensive relative to what they return per square foot. You grow them because you want the tomatoes, not because the math is great.
Cucumber is the worst performer on gross value per square foot of anything in the table: a 4 sq ft plant producing 5 lb at $2.00/lb delivers $0.25 gross per square foot. After even a modest start cost, you’re frequently underwater. If you have a small garden and you’re making cold-eyed decisions, cucumbers are hard to justify. If you love cucumbers, grow them. Just know the trade-off.
Why Kale Surprises People
Most gardeners underestimate kale. It looks like a big, leafy space-hog. It occupies 2 square feet per plant. At $3.00/lb retail, the price isn’t exciting. So it gets passed over in favor of tomatoes or peppers, which feel more dramatic.
The reason kale shows up second in the table - at $3.38 net per square foot, behind only basil - is per-plant yield. A single kale plant (Brassica oleracea var. sabellica) grown through a full season in a temperate climate produces roughly 5.5 lb of harvestable leaf, based on Penn State Extension production data for cut-and-come-again leafy brassicas. That’s $16.50 of retail kale off one plant occupying 2 square feet. Most people don’t track this number because they harvest leaves as they need them over months, rather than seeing the total accumulate.
The math: $16.50 gross / 2 sq ft = $8.25 gross per square foot. Subtract $1.50/sq ft for a transplant ($3.00 transplant / 2 sq ft) and you land at $3.38 net. That’s competitive with garlic and ahead of every fruit-bearing crop in the table.
The trade-off is that kale occupies the space for the full growing season - typically 5-7 months from transplant to final harvest in most climates. You’re not cycling it out mid-season. But if you’re looking for a single planting that delivers strong value without succession management, kale is the answer most people don’t expect.
The Space vs. ROI Distinction
These two metrics don’t move together, and conflating them leads to bad planting decisions.
ROI multiple measures the ratio of return to input cost. Dill, for example, delivers a strong ROI multiple: seeds cost almost nothing ($0.50/sq ft), and the harvest value is meaningful. At $0.50 start and $0.88 net per square foot, dill’s ROI multiple is approximately $0.88/$0.50 = 1.76x, or a 176% return on seed investment. That sounds good.
But $0.88 net per square foot is mediocre by the standards of this table. Basil starts at $3.50/sq ft (you’re buying transplants, typically) and returns $4.00 net - an ROI multiple of only 1.14x. By ROI multiple, dill beats basil. By net value per square foot, basil beats dill by 4.5x.
The right metric depends on your constraint. If you have limited money to spend on garden inputs but relatively generous space, optimize for ROI multiple - grow dill, direct-sow greens, and bush beans, which have tiny seed costs and reasonable returns. If you have limited space and can afford transplants or high-quality seeds, optimize for net value per square foot - concentrate your bed space on basil, kale, garlic, and cherry tomatoes.
Most small-garden situations favor the second approach. Thirty-two square feet is a finite resource. Spend it on the crops that return the most value per unit of that resource.
The Succession Multiplier: Where the Numbers Really Change
Single-planting figures undercount the value of fast-maturing crops. Arugula (Eruca vesicaria subsp. sativa) matures in 30-40 days from seed (Cornell Cooperative Extension). In a typical growing season of 150+ days, you can realistically plant it four times in the same bed space - early spring, late spring, late summer, and fall. Each planting returns $1.55 net per square foot. Four plantings stack to $6.20 per square foot per season. That transforms arugula from a middle-tier crop to a top-three performer on a seasonal basis.
| Crop | Net $/sq ft (single planting) | Realistic plantings/season | Seasonal $/sq ft |
|---|---|---|---|
| Cilantro | $1.75 | 4 | $7.00 |
| Arugula | $1.55 | 4 | $6.20 |
| Radish | $0.75 | 5 | $3.75 |
| Lettuce (leaf) | $1.25 | 3 | $3.75 |
| Basil | $4.00 | 1 (long harvest) | $4.00 |
| Snap pea | $1.26 | 2 (spring + fall) | $2.52 |
| Garlic | $2.00 | 1 | $2.00 |
| Kale | $3.38 | 1 | $3.38 |
Cilantro tops the seasonal table because it bolts fast (most varieties go to seed in 45-60 days in warm weather), which means you’re replanting anyway - and each replanting resets the clock on a high-value, fast-producing crop. Four cilantro successions in a 4 sq ft block will deliver $28.00 in seasonal grocery value from $2.00 in seed cost.
Radish is worth a mention here. In a single-planting analysis, radish ($0.75 net/sq ft) looks unimpressive. But radish matures in 25-30 days. Five successions per season - spring through fall, with a gap during peak summer heat - delivers $3.75 per square foot seasonally from one of the cheapest seeds you can buy. The catch: you have to actually like radishes, and you have to have a plan to use them, or they sit in the crisper and go soft. Five successive plantings of radishes is a lot of radishes.
A Worked 4x8 Bed Plan
Given 32 square feet, here’s a specific planting mix optimized for annual value. The logic: anchor the bed with long-season, high-value crops (basil, kale, garlic, cherry tomatoes) and fill the remaining space with fast-cycling succession crops (cilantro, arugula, snap peas). This plan assumes a Zone 5-7 growing season with last frost in late April and first frost in mid-October.
| Allocation | Crop | Details | Estimated seasonal value |
|---|---|---|---|
| 4 sq ft | Basil | 4 plants at 1 sq ft each | $16.00 |
| 4 sq ft | Cilantro | Broadcast sow, 4 successions | $28.00 |
| 4 sq ft | Arugula | Broadcast sow, 4 successions | $24.80 |
| 8 sq ft | Cherry tomato | 2 plants at 4 sq ft each | $48.00 |
| 4 sq ft | Kale | 2 plants at 2 sq ft each | $27.04 |
| 4 sq ft | Garlic | 24 cloves at 0.17 sq ft each | $32.00 |
| 4 sq ft | Snap peas | 24 plants at 0.17 sq ft each, 2 successions | $20.16 |
| Total | 32 sq ft | ~$196 |
A few details on the plan.
Garlic occupies the bed from fall planting through late June of the following season in most climates - it’s in the ground for 8-9 months. Plant it in October, harvest it in late June, and the 4 sq ft becomes available for a summer or fall succession crop. In the plan above, the $32.00 garlic value represents a single annual harvest from fall-planted hardneck varieties like ‘German Red’ or ‘Music.’
The snap pea allocation runs two successions: direct sow in early spring (as soon as soil can be worked, peas tolerate light frost) and again in late summer for a fall harvest. Each succession at 24 plants in 4 sq ft produces $10.08 in value ($1.26/sq ft x 4 sq ft x 2 successions = $10.08). The spring planting finishes by mid-June; the fall planting goes in early August and finishes before frost.
Cherry tomatoes carry the most weight in the plan at $48.00 for 8 sq ft, which reflects 10 lb per plant at $6.00/lb retail - a realistic yield for an indeterminate variety like ‘Sungold’ or ‘Black Cherry’ grown with a cage or stake in a productive zone. Determinate varieties will yield less; exceptional seasons will yield more. The $6.00/lb figure comes from USDA AMS premium cherry tomato pricing for pint containers ($3.50-4.00/pint, with pints averaging approximately 0.6 lb net weight).
The full plan’s $196 seasonal value from 32 square feet works out to $6.13 per square foot for the season. That’s above the single-crop leaders in the succession table, which illustrates the planning principle: the right mix of long-season anchors and fast-cycling successors outperforms any single crop.
What This Means for Planning
The table gives you the tool; here’s how to use it.
Start by listing the crops you actually eat. A garden full of high-value crops you won’t use is worth nothing. If you don’t cook with basil, it doesn’t matter that it leads the per-square-foot ranking.
From your list, separate the crops into three groups: those with seasonal $/sq ft above $3.00 (the anchors and succession stars), those between $1.00-3.00 (solid contributors), and those below $1.00 (grow them only if you have extra space or a specific reason).
Allocate the first 60% of your bed space to the top tier. Fill the remaining 40% with the middle tier, favoring crops you’ll actually use and crops with short enough maturity times that you can cycle them through multiple plantings.
Leave the bottom tier - corn, watermelon, pumpkin, winter squash - for gardeners with more than 200 square feet to work with, where space isn’t the binding constraint. There’s nothing wrong with growing corn. It’s just a decision to make with eyes open about what you’re trading away.
One adjustment worth making: if you’re in a climate with a short season (Zone 4 or colder), the succession multipliers shrink. Two arugula plantings instead of four drops the seasonal figure from $6.20 to $3.10 per square foot. Garlic and kale hold their value better in short-season climates because they’re single-season crops anyway. Factor your frost dates into any succession calculation before you build your plan.
The crops at the top of this table - basil, kale, garlic, cilantro, arugula, cherry tomatoes - are there for specific, calculable reasons. The herbs command high prices per pound at retail because they’re perishable and sold in small quantities. The greens cycle fast enough to multiply their per-planting value several times over. The kale produces extraordinary per-plant yield relative to its footprint. None of this is intuitive from a seed catalog description. The math is the point.
Yield data sourced from Penn State Extension vegetable production guides and Cornell Cooperative Extension home garden publications. Retail prices from USDA AMS Specialty Crop Market News, 2025 season averages. Spacing recommendations from UC Davis ANR home vegetable garden guidelines.