With the night for trick-or-treating officially here, there may be another pumpkin colour spotted among the sea of orange ones - and they have a special meaning.
Blue pumpkins, whether they are used to hold candy or for decoration, are often used as an indication that a house is food-allergen-friendly - and that non-food treats such as glow-sticks or stickers will be given out to trick-or-treaters.
The Teal Pumpkin Project was first started in 2014 by Food Allergy Research & Education - with the goal to raise awareness of food allergens on a night when it can be tricky to participate with a food allergy.
According to the website, a teal pumpkin placed on a doorstep is a symbol of "safety, inclusion and respect of individuals managing food allergies."
The campaign has since become a global movement, with thousands of homes participating each year.
This Halloween, however, a mum is attempting to place an additional meaning on blue pumpkins - as a symbol of autism meant to signify that a person trick-or-treating may require specific or different needs.
Alicia Plumer recently explained her idea on Facebook, where she shared that her son, who has autism, would be carrying a darker blue pumpkin.
She wrote: “Trick-or-treat… the BLUE BUCKET… if you see someone who appears to be an adult dressed up to trick-or-treat this year carrying this blue bucket, he’s our son!”
“His name is BJ and he is autistic,” the mum continued. “While he has the body of a 21-year-old, he loves Halloween. Please help us keep his spirit alive and happy.”
The mum then asked that when people see the blue bucket, they “share a piece of candy” and spread awareness.
“These precious people are not ‘too big’ to trick-or-treat,” she concluded.
The post has since been shared more than 27,000 times - with others commenting that they would keep an eye out for the blue pumpkin.
“Love this idea! Hope he has a great Halloween,” one person commented.
Another said: “I will be ready and waiting for BJ.”
According to the NHS, people with autism tend to have problems with social interaction and communication.
By carrying a blue pumpkin, Plumer hopes that it conveys to others that the person with autism wants to trick-or-treat and participate - but may not do so in the expected way.
