What does this checker do?
Most gardening disappointments trace back to the same handful of mismatches: a sun lover planted in shade, a blueberry bedded in alkaline soil, a melon crowded into a pot. This tool checks the plant you pick against four of the biggest deciding factors and gives you one of three verdicts.
Yes, this plant fits means every checked factor lines up. Yes, with some preparation means the plant can work, but something needs adjusting first, like moving the pot somewhere brighter or acidifying the bed. Probably not a good fit means at least one factor genuinely conflicts, and choosing a different plant or a different spot will save you a season of frustration.
The four checks
Light
Light is the constraint you cannot fix with fertilizer or effort. The tool compares your answer to the sun requirement in the plant's record. Full sun means 6 or more hours of direct sun, part sun is 4 to 6, and shade is under 4. Fruiting vegetables in part sun will grow, but the tool flags the yield trade-off rather than pretending it does not matter.
Space
Mature size decides whether a plant belongs in a pot, a bed, or open ground. Compact plants (roughly 12 inches of spacing or less) suit ordinary containers. Plants needing 18 inches or so want a large pot. Anything that sprawls past that fails the container check outright. The indoors option assumes houseplants, with herbs flagged as workable windowsill candidates.
Soil pH
Each plant in the library carries a preferred pH range, such as 6.0 to 6.8 for tomatoes or 4.5 to 5.5 for blueberries. If your tested pH lands inside the range, that factor passes. Within about half a point of the edge, the factor is marked as fixable with amendment. Farther out, it counts as a real conflict. Leave the field blank and the check is skipped instead of guessed.
Growing season
Enter a ZIP code and the tool looks up the frost-free window at the weather station nearest you, then compares it against the plant's days to maturity. Tender crops that cannot fit their shortest season between your median spring and fall freezes are flagged. Hardy crops pass automatically, since frost does not limit them the same way.
What the verdict does not cover
The checker deliberately sticks to the big four. It does not evaluate water, humidity, soil drainage, summer heat, or pests, because those vary block by block and change week to week. A passing verdict means "no obvious dealbreaker," not "guaranteed harvest." The plant's own page covers the deeper requirements.
Common mistakes
Trusting the guess on sunlight
The number people estimate for sun is almost always high. If the light factor surprises you, watch the actual spot on a clear day or run the sun calculator first and bring its answer back here.
Skipping the pH check because the number is unknown
A soil test costs little and changes the answer for plants with strong preferences, like blueberries, lavender, and brassicas. The check is optional, but it is the one most likely to reveal a hidden problem.
Treating a fail as never
A conflict usually means "not as things are," not "never." Shade ruled out tomatoes? Containers on the sunny patio change the light answer. Alkaline soil blocked blueberries? A raised bed filled with acidic mix changes the pH answer. Rerun the check with the adjusted conditions.
When this tool may not be the right choice
The checker answers "does this plant fit my spot," not "what should I grow." For that direction, the what should I plant tool searches the whole library by your conditions. For timing rather than suitability, the planting calendar and what can I plant this week tools work from your freeze dates. The checker also does not cover lawn alternatives or wild native plant selection by ecoregion.
Where our data comes from
Plant requirements (sun, pH range, spacing, frost tolerance, days to maturity) come from the same library that powers the plant pages. The frost-free season uses NOAA 1991 to 2020 climate normals at the station nearest your ZIP code. Sun thresholds follow the definitions extension services use: full sun at 6 or more hours, part sun at 4 to 6, and shade below 4.
Frequently asked questions
Why did my plant fail a check? The result lists each factor separately, so look for the one that conflicted. A light or season conflict means choosing a different spot, a container, or a different plant. A pH conflict is often fixable with amendment, which is why the tool marks it as preparation rather than a fail.
What if I do not know my soil pH? Leave the field blank and the pH check is skipped instead of guessed. A soil test costs little and it changes the answer for plants with strong preferences like blueberries and lavender, so it is worth running before any permanent planting.
Does a pass mean the plant will do well? It means no obvious dealbreaker among the checked factors. Water, drainage, summer heat, and pests are not evaluated, so treat a pass as permission to proceed, not a guarantee. The plant's own page covers the rest of its requirements.
