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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.myscienceproject.org/pumpkin.html

How Do You Preserve a Jack O' Lantern? ... We gathered some tips from various pumpkin carving resources, and also ... After 48 hours, the first spots of mold had appeared. ... We tossed it and turned our attention to the last two survivors. ... that you want to keep looking pristine for as long as possible, we recommend using ...

www.quora.com/How-long-does-the-average-pumpkin-last-after-it-is-carved

When I moved to California I was horrified by how fast my carved pumpkins rotted . It turns out that being left outside at 70 F really encourages mold growth.

www.examiner.co.uk/news/west-yorkshire-news/how-long-carved-pumpkins-last-10305342

Oct 21, 2015 ... After it's been carved, rinse it out with water to get rid of the excess ... Click below to see some of the best pumpkin creations from last year!

answers.yahoo.com/question/index?qid=20061015160629AAR2lxi

Best Answer: Pumpkins can last several weeks once carved if the weather stays cold. ... Your friend's pumpkin should last until Halloween.

www.thekitchn.com/5-ways-to-make-your-halloween-pumpkin-last-longer-211180

Oct 24, 2016 ... ... extend the life of your pumpkin and keep it looking fresh-from-the-patch for as long as possible. ... Here's Mat's advice for making those Halloween carved pumpkins last ... Once you've found your perfect pumpkin, it's time to dig in. ... are poison-free ways to prevent fruit flies from settling in to do damage.

food-hacks.wonderhowto.com/how-to/prevent-carved-uncarved-pumpkins-from-rotting-0158208

Oct 29, 2014 ... After you've carved an amazing design or face into a pumpkin or ... The entire pumpkin should sit in the solution for two minutes. ... Petroleum jelly is a great way to keep your carved pumpkins from drying out and getting that wrinkly look. ... to preserve pumpkins, as long as it's an acrylic liquid type of cleaner ...

www.wikihow.com/Maintain-a-Carved-Pumpkin

After all your hard work, it's usually disheartening to see your pumpkin grow moldy. ... your pumpkin forever, there are a few things you can do to make it last a little bit longer.... ... It depends on how long it's going to be before you need them.

www.botanicalinterests.com/articles/view/36/Pumpkins-Tips-for-Keeping-Carved-Pumpkins-Perky

Once carved, you can keep your pumpkin fresh for up to a week by either ... or if it is rainy, you should dry off and refrigerate your carved pumpkins at night.

www.reference.com/holidays-celebrations/long-pumpkins-last-after-carve-6ea721ee24a127d0

Pumpkins usually only last a few days after you carve them. This is due to a number of ... simple hydration. The skin protects the inside of the pumpkin and, once...