Your canning process was deficient in some way - improper seals or inadequate time and/or temperature.
Bacteria that gets into the pumpkin causing it to rot.
You leave it sitting out for a week or more
no you cant because it would puncture your pumpkin and then it would rot.
The bugs will invade and the pumpkin, and maybe the vine, will be eaten/rot away.
Pumpkin leaves turn yellow due to a lack of nutrients, such as nitrogen, or due to overwatering, which can lead to root rot.
The largest pumpkin on record is the one that was used as a coach for CInderella after she meets the Prince in the fairy tale. After she got home they feed the pumpkin to the barn animals other wise it would rot. Phillippee Saint Pierre carved the pumpkin but was never honored by the League of Farmers in France in 1756.
Signs of a bad pumpkin include soft or mushy spots, which indicate rot, and an unpleasant odor suggesting decay. Look for discoloration, particularly dark or black areas, and any signs of mold on the surface. A shriveled or overly hard skin can also signal that the pumpkin is past its prime. Lastly, if the stem is dry and brittle, the pumpkin may not be fresh.
The cast of The Adventures of the Scrabble People in a Pumpkin Full of Nonsense - 1985 includes: George Atkins as Muddler Catherine Hart as Rotunda Bob Singer as Rot
The four ways to know your pumpkin is ripe is. 1.See what colour it is. The chances are if your pumpkin is orange all the way around. But on the other hand some pumpkins are completely green. 2.Give the pumpkin a good thump or slap. If it sounds hollow then it's ripe. 3.If the skin on the pumpkin is hard then you know it's ripe. Use a fingernail and gently try to puncture the pumpkin's skin. If the skin dents but does not puncture, the pumpkin is ripe. 4.If the stem above the pumpkin starts to turn hard then it is ripe.
Verbs associated with a pumpkin include "grow," as they develop from seeds, "harvest," when they are picked in the fall, "carve," during Halloween preparations, and "cook," as they are often used in recipes like pies and soups. Additionally, pumpkins can "decorate" spaces for seasonal festivities and "rot" if left unused.
You can tell if your pumpkin plant is being overwatered by checking the soil for excessive moisture, yellowing or wilting leaves, and a lack of new growth. Overwatering can lead to root rot and other issues, so it's important to adjust your watering schedule accordingly.
I usually carve my pumpkin from the night before to a week before. Too long and they start to mold and rot and that will be sure to scare people away.