Calabaza de invierno

UMN Extension, 'Squash vine borers', extension.umn.edu/yard-and-garden-insects/squash-vine-borers (read 2026-07-11): 'squash vine borers spend the winter in the soil near their host plants ... Practice rotation ... planting cucurbits in different areas of your garden if possible, or alternate seasons'; 'rotate away from the area and destroy crop residue.'

Ohioline (Ohio State Univ.), 'Squash Vine Borer', ohioline.osu.edu/factsheet/ent-0106 (read 2026-07-11): 'Crop rotation away from previously infested fields helps reduce local populations, as overwintering pupae remain in the soil. However ... fields often need to be rotated more than 5 miles away as SVB can fly into fields from long distances.'

UMN Extension, 'Squash bugs', extension.umn.edu/yard-and-garden-insects/squash-bugs (read 2026-07-11): 'Squash bugs can live through the winter as adults in sheltered places, such as under plant debris, around buildings, or under rocks. When adults come out in the spring, they fly to growing cucurbit plants.'

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.

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.

UMN Extension, 'Powdery mildew of cucurbits', extension.umn.edu/agriculture/specialty-crops/vegetable-farming/disease-management/powdery-mildew-of-cucurbits (fetched in-container 2026-09-25, read 2026-09-25): 'White powdery spots can form on both upper and lower leaf surfaces, and quickly expand into large blotches.'; 'When powdery mildew infects the majority of the foliage, the plant becomes weak and the fruit ripens prematurely.'; 'The older leaves are more susceptible and powdery mildew will infect them first.'; 'Wind blows spores produced in leaf spots to infect other leaves.'; 'Powdery mildew is more likely to infect densely planted vines, plants crowded by weeds, plants in shaded sites and over-fertilized plants.'; 'Plant varieties with complete or partial resistance to powdery mildew.'; 'Provide good air movement around plants through proper spacing, staking of plants, and weed control.'; 'Powdery mildew, mainly caused by the fungus Podosphaera xanthii , infects all cucurbits, including muskmelons, squash, cucumbers, gourds, watermelons and pumpkins.'; 'If susceptible varieties are growing in an area where powdery mildew has resulted in yield loss in the past, fungicide applications may be necessary.'; 'Monitor for the presence of powdery mildew, and start fungicide treatments when disease is first found.'

UW-Madison Extension (Wisconsin Horticulture), 'Squash Vine Borer, Melittia cucurbitae', hort.extension.wisc.edu/articles/squash-vine-borer-melittia-curcurbitae/ (fetched in-container 2026-09-25, read 2026-09-25): 'If you've ever had a squash or pumpkin plant with one or more runners that suddenly wilt and then die, it was mostly likely infested by squash vine borer.'; 'Their feeding within the vines destroys the vascular tissues of the plant, preventing water movement and nutrient transfer, which leads to the characteristic wilting.'; 'As they feed, they push their sawdust-like fecal matter (frass) out of holes in the side of the stem near the wilting point.'; 'At the first sight of frass, homeowners can carefully slit the vine lengthwise near the damaged area and remove the larvae.'; 'Plants can be covered with floating row cover but only where squash didn't grow the previous year.'; 'The adult squash vine borer is a day-flying moth, with a distinctive superficial appearance more like a wasp than a moth.'; 'Females lay up to 250 small flattened, oval, and dull-red to brown eggs individually, rather than in groups, on the base of plants, leaf stalks, and vines which are almost impossible to spot.'; 'For vining (not bush) varieties, try burying a few nodes along each vine so the plant will root at these nodes and less the impact of the pest if it does infest the base of the vine.'