How to Measure Garden Success With Real Numbers

"It was a good season" is a feeling, not a measurement. Gardeners who track a handful of simple numbers season over season can actually tell whether a change — new soil mix, tighter spacing, a different watering schedule — helped, hurt, or made no difference at all.

Yield Per Square Foot

Weigh your harvest from a bed across the season and divide by the bed's square footage. A 32-square-foot bed producing 60 pounds of mixed vegetables across a season gives you 1.875 pounds per square foot. This single number lets you compare a raised bed against a row garden, or this year's tomato bed against last year's, regardless of the bed's shape or size. A well-run intensive vegetable bed typically lands between 1 and 3 pounds per square foot per season, depending heavily on crop choice — leafy greens and root crops run higher, large vining crops run lower per square foot even though individual plants may yield more total weight.

Cost Per Pound

Add up seed cost, soil amendments, and any water cost for the season, divide by total harvest weight. If your seed and soil inputs for a season totaled forty dollars and you harvested 60 pounds, that's roughly sixty-seven cents per pound — almost certainly cheaper than grocery-store organic produce, which makes the case for gardening concrete rather than assumed. Tracking this number over several seasons also reveals whether investments like drip irrigation or raised bed frames pay for themselves in reduced cost per pound over time.

Germination Success Rate

Count seeds planted and seedlings that emerged for each crop, then divide to get your actual germination rate. If you planted 40 carrot seeds and 28 came up, that's a 70 percent rate — useful to compare against the 80 percent the packet claimed. A gap that large, repeated across multiple crops from the same seed source, suggests old seed stock or storage problems worth fixing before next season rather than assuming your soil or technique is at fault.

Days-to-Harvest Accuracy

Log your planting date and your actual first-harvest date for each crop, then compare against the packet's days-to-maturity number. If your packet said 60 days but your actual harvest came at 68 days, that's a 13 percent overrun — worth remembering for next year's succession planting schedule, since it means your microclimate consistently runs slower than seed trial conditions assumed.

Space Efficiency Over Time

Track how many total plants you fit in a bed versus how many the spacing charts say should fit. If a 32-square-foot bed rated for roughly 60 lettuce plants at 4-inch spacing only fit 45 in practice, that 25 percent gap points to something worth investigating — oversized transplants, inconsistent spacing while planting, or a chart that didn't match your actual variety.

Building a Simple Log

You don't need software for any of this. A notebook or spreadsheet with five columns — crop, planting date, harvest date, seeds planted, harvest weight — captures every number above. Total time investment is a few minutes per week during the season, and the payoff compounds: by year three you have three seasons of comparable data instead of three seasons of vague memories.

What These Numbers Don't Capture

Yield-per-square-foot and cost-per-pound say nothing about flavor, resilience to pests, or how much you enjoyed growing something. Treat these metrics as one input to next year's decisions, not the only one — a lower-yielding heirloom tomato variety might still be worth growing over a higher-yielding hybrid if the flavor difference matters more to you than the numbers suggest it should.

The Five Numbers Worth Tracking

• Yield per square foot (total harvest weight divided by bed area) is the single most useful number for comparing seasons.
• Cost per pound of produce accounts for seed, soil, and water spend, revealing whether a garden actually saves money.
• Germination success rate, tracked per crop, tells you whether to trust or discard a seed source next season.
• Days-to-harvest accuracy (actual vs. packet estimate) improves your planning precision every year you track it.
• A garden log turns "it was a good season" into comparable numbers you can act on next year.

None of these ratios require more than basic arithmetic, and each one gets more useful the longer you track it.