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Cleome serrulata · familia de las cleomáceas · USDA PLANTS: CLSE
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Rocky Mountain Bee Plant (Cleome serrulata) es una planta anual (familia de las cleomáceas).
Lo que la semilla necesita antes de brotar.
USDA-NRCS Plant Guide, 'Rocky Mountain beeplant / Cleome serrulata' (Tilley & Wolf 2024, Aberdeen PMC), nrcs.usda.gov/plantmaterials/idpmcpg14112.pdf (fetched in-container 2026-09-20, read by the maintainer 2026-09-20 via the batch-3 germination review): 'Seeds often have significant dormancy and various pre-treatments have been explored. Chilling duration, gibberellins, and seed after-ripening all influence seed germination and can be used to improve plant establishment', and 'Stratifying seed in cold, moist sand for 30 days is commonly recommended for spring seeding'. Recorded as a cold-moist stratify treatment; the mechanism is the seed's significant innate dormancy, which the chilling period overcomes. CORRECTION TO THE BATCH-3 REVIEW: the review sheet attributed the stratification to a USDA Forest Service 'prechilling required to relieve seed dormancy' statement, but the FS 'Plant of the Week' page for this species carries NO germination data at all, and NRCS says stratification is 'commonly recommended', not 'required'. NO germination_soil_temp_c, days_to_germinate or seed_viability_years is recorded: NRCS gives no longevity in years, and its germination data points the OTHER way from the sheet's proposed 68-80 F / 5-20 days - best germination was at 4 C (39 F) with gibberellic acid, while untreated seed at 22 C (72 F) under 24-hour light produced no seedlings in 20 days - so those figures are not stored. [read]
These are estimates from general gardening knowledge, or the sources disagree on them, so treat them as a starting point rather than a firm figure.
Mecanismo: Nucleación de hielo en el tejido de la hoja.
Evidence: settled without a trial - climatology.
Siembra o trasplanta después de la fecha de la última helada, o empieza en interiores y trasplanta cuando haya pasado.
Mecanismo: Resistencia al frío. Los cultivos resistentes toleran heladas fuertes y los semirresistentes toleran heladas ligeras, así que pueden ocupar la tierra semanas antes de que se permita la entrada a los cultivos sensibles a las heladas. El desfase se mide desde la última helada de primavera.
Evidence: confirmed against 4 sources in the research-based literature.
University of Illinois Extension, 'Time Your Vegetable Plantings by Cold Hardiness' (2018-03-26), extension.illinois.edu/blogs/ilriverhort/2018-03-26-time-your-vegetable-plantings-cold-hardiness: very hardy vegetables 'withstand freezing temperatures and hard frosts without injury' (planted earliest in spring); frost-tolerant vegetables 'can withstand light frosts, but not freezing temperatures' (planted a couple of weeks later). LLM-summarised from a read of the page; it establishes the CATEGORIES but states no week offsets.
Colorado State Univ. Extension, GardenNotes #720, 'Vegetable Planting Guide', extension.colostate.edu/resource/vegetable-planting-guide (read 2026-07-25): hardy vegetables go in 'As early as 2-4 weeks before the date of the average last spring frost'; semi-hardy 'As early as 0-2 weeks before the date of the average last spring frost'; tender from seed 'around the date of the average last spring frost'; very tender 'Typically 2+ weeks after'. This is the source that states the offsets in weeks.
Where this rule sits in that range: hardy at 3 weeks is mid-range of CSU's 2-4. Half-hardy at 2 weeks is the EARLIEST EDGE of CSU's 0-2 - the most aggressive planting CSU sanctions, not the middle of it. The rule is inside published guidance at both ends, but it leans early on the half-hardy side and a gardener following it in a cold spring is taking that boundary.
Do not import an offset from another publication's hardiness scheme without checking the category names: CSU has no 'very hardy' tier, so a '4-6 weeks before frost' figure written against a four-tier scheme does not describe CSU's 'hardy'. Categories are not comparable across sources.
Mecanismo: Un cultivo sensible a las heladas con muchos días a la cosecha no puede madurar si solo se siembra directamente después de la última helada — la ventana sin heladas es demasiado corta. Una ventaja inicial bajo cubierta compra las semanas que le faltan a la temporada; la plántula solo se trasplanta una vez que ha pasado la helada — la fecha de trasplante sigue dependiendo de la helada.
Evidence: confirmed against 2 sources in the research-based literature.
University of Minnesota Extension, 'Starting seeds indoors', extension.umn.edu/planting-and-growing-guides/starting-seeds-indoors: seed-starting chart gives tomato '5-6 weeks' and pepper and eggplant '9 weeks' before the outdoor planting date (warm crops set out after the last frost). Read 2026-07-19 (LLM-summarised); read by the maintainer 2026-07-25, which is the read that promoted this rule. Note what the corpus's per-crop values do with the sources: tomato 6 sits at the top of Minnesota's '5-6 weeks' and inside Illinois's '6-8'; pepper and eggplant 8 sit BELOW Minnesota's '9 weeks' and at the top of Illinois's '6-8'. They are a reconciliation of two published ranges, not a figure either source prints.
University of Illinois Extension, 'When should I start my seeds?' (2023-02-10), extension.illinois.edu/blogs/good-growing/2023-02-10-when-should-i-start-my-seeds: peppers, tomatoes, and eggplant started '6-8 weeks before the last frost'. Read 2026-07-19.
Otras 120 reglas dependen de tu huerto y no de la planta — rotación de cultivos, fechas de helada, sol, distancia entre plantas y suelo. Velas todas.
Milpa Gardens. "Rocky Mountain Bee Plant (Cleome serrulata)." https://milpa.garden/es/plants/cleome-serrulata/
A garden-planning corpus: every claim states its evidence grade and links its sources on the page. Cite it with the grade, and add the date you read it.