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Jack-o-Lanterns look best for the first 48 hours after carving, and will then start to dry out, shrivel and get moldy.
To make it last longer, you can put petroleum jelly over the cut edges, and keep in a cool place like the refrigerator when not on display.

www.pumpkincarving101.com/pumpkin_lifespan.html

Depending on your local weather conditions during the month of October, an un- treated, carved pumpkin can have a life span any were of from a week to only a ...

www.npr.org/sections/thesalt/2011/10/05/141094067/how-long-does-a-pumpkin-last

Oct 24, 2011 ... But cold weather can cut into a pumpkin's lifespan. A little light frost ... around the fruit. Once the carving begins, leave the stem on, experts say.

www.myscienceproject.org/pumpkin.html

We chose 6 carving pumpkins of approximately the same size, shape and .... The longevity of the control pumpkin was unexpected, as we anticipated it to be the ...

festivals.iloveindia.com/halloween/jack-o-lanterns/preserving-pumpkins.html

Here are tips for preserving pumpkins, ideas to preserve carved pumpkins for Halloween and how to increase life span of Jack O Lanterns.

www.zmescience.com/other/feature-post/how-long-carved-pumpkins-last-and-how-you-can-make-it-last-more

Oct 23, 2015 ... How long carved pumpkins last – and how you can make it last more ... Carved pumpkins have a limited life span, and now you know how to ...

www.eatbydate.com/fruits/fresh/how-long-does-pumpkin-last

Apr 21, 2015 ... The shelf life of pumpkin is tricky because there is no sell by date, use by date or even a best before date attached anywhere to the squash.

news.aces.edu/blog/2015/10/25/keep-scare-jack-o-lantern-halloween

Oct 25, 2015 ... The life span of the jack-o-lantern is a short one. The day after carving the pumpkin, there is a noticeable difference in the pumpkin and by the ...

www.almanac.com/content/how-carve-pumpkin

Pumpkin carving tips and advice on how to pick a pumpkin for carving! ... Putting a candle or other light inside will shorten its life span, as the heat that results ...

www.drfrybrain.com/longevity/index.html

The number one question we receive from fellow pumpkin carving ... her prize, but we have developed and follow these seven steps for Jack o'Lantern longevity :.