{"schemaVersion":"2.0","generatedOn":"2026-10-11","meta":{"title":"SoilCommander Garden Layout Planner v2 knowledge base","generatedOn":"2026-07-17","provenance":"Built from a Gemini Deep Research report anchored on RHS (rhs.org.uk) and Garden Organic, UK conditions.","layoutModel":"Intensive block / grid planting (equidistant spacing).","unitPolicy":"Metric (cm, plants per m2). Month numbers 1-12, baseline Central UK.","dataIntegrity":"No values invented. UNVERIFIED source fields are null and flagged. Derived values (block spacing, plants/m2 from in-row, harvest from days-to-maturity, season->month mapping) are labelled in each crop's 'flags'.","nitrogenFixationNote":"Cross-source dispute: RHS presents legumes as fixing nitrogen that benefits neighbouring crops during the season (basis of 'Three Sisters'); Garden Organic states the legume uses that nitrogen for its own pods and only releases it when the plant is cut down and roots decompose. The tool should treat the Three Sisters pairing as Tier-1 for PHYSICAL support/shade, and label the in-season nitrogen benefit as disputed rather than asserting it.","cropCount":53,"v2Note":"v1 RHS/Garden Organic data plus sourced North American timing, days to maturity, per-person planting amounts, herbs and flowers. See FACT-CHECK-LOG-PLANNER-V2.md."},"sources":{"csu720":{"title":"Vegetable Planting Guide (CMG GardenNotes #720), published June 2018, reviewed Sept 2024","publisher":"Colorado State University Extension","url":"https://extension.colostate.edu/resource/vegetable-planting-guide/","file":"planner-v2/sources/csu-720.txt"},"cce":{"title":"Vegetable Planting Guide (Hort 52, 6/11), Rockland County: last frost May 15, first frost ~Nov 5","publisher":"Cornell Cooperative Extension of Rockland County","url":"https://rocklandcce.org/resources/vegetable-planting-guide","file":"planner-v2/sources/cce-rockland.txt"},"vce331":{"title":"Vegetable Planting Guide, MH 331 (reprinted January 1981): \"Approx. # of row ft. to plant per person\"","publisher":"Virginia Cooperative Extension","url":"http://hdl.handle.net/10919/80851","file":"planner-v2/sources/vce-mh-331.pdf"},"rhsBasil":{"title":"Basil: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/herbs/basil/grow-your-own"},"rhsParsley":{"title":"Parsley: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/herbs/parsley/grow-your-own"},"rhsChives":{"title":"Chives: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/herbs/chives/grow-your-own"},"rhsDill":{"title":"Dill: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/herbs/dill/grow-your-own"},"rhsCoriander":{"title":"Coriander: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/herbs/coriander/grow-your-own"},"rhsMint":{"title":"Mint: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/herbs/mint/grow-your-own"},"rhsThyme":{"title":"Thyme: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/herbs/thyme/grow-your-own"},"rhsKohlrabi":{"title":"Kohl rabi: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/vegetables/kohl-rabi/grow-your-own"},"rhsPakChoi":{"title":"Pak choi: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/vegetables/pak-choi/grow-your-own"},"rhsMelon":{"title":"Melons: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/fruit/melons/grow-your-own"},"rhsSweetPotato":{"title":"Sweet potatoes: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/vegetables/sweet-potatoes/grow-your-own"},"rhsNasturtium":{"title":"Plants for kids: nasturtium","publisher":"RHS","url":"https://www.rhs.org.uk/education-learning/gardening-children-schools/family-activities/grow-it/grow/nasturtium"},"rhsCalendula":{"title":"Calendula plant guide","publisher":"RHS","url":"https://www.rhs.org.uk/plants/calendula"},"rhsSunflower":{"title":"How to grow Helianthus (sunflowers)","publisher":"RHS","url":"https://www.rhs.org.uk/plants/helianthus/growing-guide"},"rhsTagetes":{"title":"Tagetes patula 'Naughty Marietta' (product growing notes)","publisher":"RHS Plants","url":"https://www.rhsplants.co.uk/plants/_/tagetes-patula-naughty-marietta/classid.2000014888/"},"rhsRunner":{"title":"Runner beans: grow your own","publisher":"RHS","url":"https://www.rhs.org.uk/vegetables/runner-beans/grow-your-own"},"ugaSunflower":{"title":"Growing Sunflowers in the Home Garden (C 1121), R. Westerfield","publisher":"University of Georgia Extension","url":"https://fieldreport.caes.uga.edu/wp-content/uploads/2025/08/C-1121_2.pdf","file":"planner-v2/sources/uga-c1121.txt"},"gardenOrganic":{"title":"Companion or mixed planting","publisher":"Garden Organic","url":"https://www.gardenorganic.org.uk/expert-advice/how-to-grow/how-to-grow-flowers/companion-or-mixed-planting"},"umdCPB":{"title":"Colorado Potato Beetle on Vegetables","publisher":"University of Maryland Extension","url":"https://extension.umd.edu/resource/colorado-potato-beetle-vegetables"},"umdICW":{"title":"Imported Cabbageworm on Vegetables","publisher":"University of Maryland Extension","url":"https://extension.umd.edu/resource/imported-cabbageworm-vegetables"},"umdSVB":{"title":"Squash Vine Borer on Vegetables","publisher":"University of Maryland Extension","url":"https://extension.umd.edu/resource/squash-vine-borer-vegetables"},"umdCB":{"title":"Cucumber Beetles: Spotted or Striped on Vegetables","publisher":"University of Maryland Extension","url":"https://extension.umd.edu/resource/cucumber-beetles-spotted-or-striped-vegetables"},"usuFlea":{"title":"Flea Beetles on Vegetables","publisher":"Utah State University Extension","url":"https://extension.usu.edu/planthealth/research/flea-beetles-vegetables"},"uwSquashBug":{"title":"Squash Bug, Anasa tristis","publisher":"University of Wisconsin-Madison Extension","url":"https://hort.extension.wisc.edu/articles/squash-bug-anasa-tristis/"}},"classWindows":{"hardy":[-4,-2],"semi-hardy":[-2,0],"tender":[0,0],"very-tender":[2,2]},"rotationGroups":{"legumes":{"label":"Legumes","note":"Nitrogen-fixing; brassicas benefit following them. 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Strawberry, rhubarb, asparagus."}},"companionPlantsGlossary":{"French marigold (Tagetes)":{"benefit":"Trap crop drawing whitefly away from tomatoes; roots also suppress some nematodes.","tier":1,"source":"https://www.gardenorganic.org.uk/expert-advice/how-to-grow/how-to-grow-flowers/companion-or-mixed-planting"},"Nasturtium":{"benefit":"Sacrificial trap crop that lures blackfly/aphids away from beans and brassicas.","tier":1,"source":"https://www.gardenorganic.org.uk/expert-advice/how-to-grow/how-to-grow-flowers/companion-or-mixed-planting"},"Clover / trefoil (living mulch)":{"benefit":"Undersowing brassicas disrupts the cabbage root fly's visual detection of the crop.","tier":1,"source":"https://www.rhs.org.uk/advice/grow-your-own/features/companion-planting"},"Sweet alyssum (Lobularia maritima)":{"benefit":"Nectar attracts hoverflies and parasitic wasps that predate aphids on lettuce.","tier":1,"source":"https://www.rhs.org.uk/advice/grow-your-own/features/companion-planting"},"Basil":{"benefit":"Traditionally interplanted with tomatoes; limited empirical support for pest deterrence.","tier":2,"source":"https://www.gardenorganic.org.uk/expert-advice/how-to-grow/how-to-grow-flowers/companion-or-mixed-planting"}},"crops":[{"id":"tomato","name":"Tomato (outdoor / cordon)","names":{"uk":"Tomato (outdoor / cordon)","na":"Tomato (outdoor / cordon)"},"family":"Solanaceae","rotationGroup":"solanaceae","group":"veg","sun":"full","heightClass":"tall","habit":"cordon","heightCm":null,"spreadCm":null,"support":true,"supportNote":"Tall canes or string; heavy fruit load.","perennial":false,"container":false,"containerOnly":false,"blockCm":45,"spacingApprox":true,"betweenRowCm":null,"protectedIn":[],"sowingMethod":"indoors","uk":{"sow":[2,3,4],"plantOut":[5],"harvest":[7,8,9],"protect":[5],"flower":null,"approx":false,"src":"v1 (RHS / Garden Organic)"},"na":{"cls":"very-tender","transplant":[2,2],"indoor":[8,6]},"ukOnlyAutumn":false,"dtm":{"min":65,"max":90,"from":"transplant"},"perPerson":{"rowFt":[10,15],"inRowIn":[18,36],"per10ft":[3,7]},"pests":[{"name":"Tomato blight","type":"disease","region":"uk","months":[6,7,8,9],"action":"Use resistant cultivars; 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weak evidence for pest deterrence.","inCropSet":true,"source":"https://www.gardenorganic.org.uk/expert-advice/how-to-grow/how-to-grow-flowers/companion-or-mixed-planting"}],"avoid":[{"partner":"potato-maincrop","tier":3,"reason":"Shared susceptibility to late blight (Phytophthora infestans).","inCropSet":true,"source":"https://www.rhs.org.uk/vegetables/tomatoes/grow-your-own"}]},"flags":["spacing_derived_from_inrow","feeder_unverified_in_source"],"sources":["https://www.rhs.org.uk/vegetables/tomatoes/grow-your-own","https://www.rhs.org.uk/advice/grow-your-own/containers/may-edible-container-idea"]},{"id":"potato-maincrop","name":"Potato (maincrop)","names":{"uk":"Potato (maincrop)","na":"Potato"},"family":"Solanaceae","rotationGroup":"solanaceae","group":"veg","sun":"full","heightClass":"medium","habit":"mounded","heightCm":null,"spreadCm":null,"support":false,"supportNote":"No support; earth up stems as they grow.","perennial":false,"container":false,"containerOnly":false,"blockCm":41,"spacingApprox":false,"betweenRowCm":{"min":38,"max":50},"protectedIn":[],"sowingMethod":"direct","uk":{"sow":[4],"plantOut":[4],"harvest":[8,9,10],"protect":[6,7,8,9],"flower":null,"approx":false,"src":"v1 (RHS / Garden Organic)"},"na":{"cls":"semi-hardy","directSow":[-2,0]},"ukOnlyAutumn":false,"dtm":{"min":125,"max":125,"from":"planting"},"perPerson":{"rowFt":[75,100],"inRowIn":[10,21]},"pests":[{"name":"Potato blight","type":"disease","region":"uk","months":[6,7,8],"action":"Remove top growth at first sign; 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avoid thinning in still air; resistant cultivars.","source":"https://www.rhs.org.uk/vegetables/carrots/grow-your-own"}],"companions":{"allies":[{"partner":"onion-sets","tier":2,"reason":"Traditional scent-masking; trials inconsistent — mesh is more reliable.","inCropSet":true,"source":"https://www.gardenorganic.org.uk/expert-advice/how-to-grow/how-to-grow-flowers/companion-or-mixed-planting"}],"avoid":[]},"flags":["harvest_derived_from_days_to_maturity"],"sources":["https://www.rhs.org.uk/vegetables/carrots/grow-your-own"]},{"id":"onion-sets","name":"Onion (sets)","names":{"uk":"Onion (sets)","na":"Onion (sets)"},"family":"Amaryllidaceae","rotationGroup":"alliums","group":"veg","sun":"full","heightClass":"low","habit":"bulb","heightCm":null,"spreadCm":null,"support":false,"supportNote":null,"perennial":false,"container":false,"containerOnly":false,"blockCm":13,"spacingApprox":false,"betweenRowCm":{"min":20,"max":30},"protectedIn":[],"sowingMethod":"direct","uk":{"sow":[1,2,3,4],"plantOut":[3,4,9],"harvest":[],"protect":[3,4,9],"flower":null,"approx":false,"src":"v1 (RHS / Garden Organic)"},"na":{"cls":"hardy","directSow":[-4,-2]},"ukOnlyAutumn":false,"dtm":{"min":90,"max":110,"from":"planting"},"perPerson":{"rowFt":[15,25],"inRowIn":[2,4]},"pests":[{"name":"Birds","type":"pest","region":"uk","months":[3,4,9],"action":"Fleece/net until sets are rooted (birds tug them out).","source":"https://www.rhs.org.uk/vegetables/onions/grow-your-own"},{"name":"Onion white rot","type":"disease","region":"uk","months":[6,7,8],"action":"No cure in soil — enforce strict long rotation.","source":"https://www.rhs.org.uk/advice/grow-your-own/in-month/september-jobs"}],"companions":{"allies":[{"partner":"carrot","tier":2,"reason":"Traditional reciprocal scent-masking; 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