It will take about 8-12 weeks for the pumpkin pieces to completely break down. Once carved, pumpkins will generally only hold up for three to five days — or up to two weeks if you live in a colder climate — before wilting and showing signs of decay.
Factors Influencing Decomposition
Several factors affect how long it takes for a pumpkin to decompose. The temperature plays a crucial role in the decomposition process, with warmer temperatures speeding up the process and colder ones slowing it down. Moisture is also a significant factor; a dry pumpkin will decompose more slowly than a moist one.
If you plan on keeping your pumpkins outside, be sure to place them in a dry, shaded spot—like a covered porch—for the entire season. Too much hot sun or rain can speed up a pumpkin’s decaying process.
Life Cycle of Pumpkins
Pumpkins left in the field will decompose, leaving seeds that can sprout and grow into a new pumpkin plant the following year, continuing the pumpkin’s life cycle. Uncarved pumpkins can last two to three months if kept out of the hot sun or freezing temperatures.
Pumpkins are biodegradable so there’s no reason to add them to a landfill. The decaying pumpkin will add nutrients to the soil, benefiting both the earth and your garden. Just make sure to remove the seeds to prevent an unintended pumpkin patch.
Preserving Pumpkins
You can try several methods to make a pumpkin last longer. One method is to:
- Clean the pumpkin thoroughly and remove any dirt or debris.
- Apply a thin layer of petroleum jelly or vegetable oil to the surface of the pumpkin to help seal in moisture.
- Keep the pumpkin in a cool and dry environment to prolong its lifespan.