Instructables

Step 1: Obtain Plexiglass

Commercial polycarbonate boxes for growing square watermelons run about $85 plus shipping. But you can make one for about $8 out of plexiglass. You'll need six rectangles of 1/4" or thicker plexiglass or other translucent plastic. Free and super cheap plastic pieces can be had from sign-making shops--ask for scraps! Or try to find a plastic supply warehouse that caters to farmers, these will usually be the cheapest source for plexiglass. If you buy plexiglass scraps, ask to have them cut into rectangles 8.5" x 8". If you are doing the cutting yourself, you can use a table saw, band saw, or a hand saw.

Step 3: Assemble the Box

Assemble your box and reinforce liberally with clear packing tape. The keyhole lid should be hinged on one side to allow the watermelon to be slipped in and out. I also twisted baling wire around it for more strength.

Step 4: Rotate the Melon as it grows.

You grow the watermelon just like any regular watermelon, except that you also rotate the box every few days to ensure it becomes green all over. Otherwise you'll get a yellow spot on the bottom, and uneven growth.
 
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admin5 years ago
Hey, this is a great instructable and is very informative. Just one thing is missing... pictures! It really helps a lot when trying to follow directions so you should consider taking some photographs. Once you do that and leave me a message when you have so that we can publish your work. Thanks! Thanks for the cool instructable and we hope to publish this soon!
admin5 years ago
Hey, this is a great instructable and is very informative. Just one thing is missing... pictures! It really helps a lot when trying to follow directions so you should consider taking some photographs. Once you do that and leave me a message when you have so that we can publish your work. Thanks! Thanks for the cool instructable and we hope to publish this soon!
melonmoldcom3 months ago

We sell these molds at melonmold.com and on eBay, Amazon, and ETSY. Our molds will last for numerous growing seasons and ship from the US. They're also MUCH cheaper than $85.

Visit us at melonmold.com.

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fruitmouldcom11 months ago
it is a thing for sure that it would be much more costly if you make one at home and very time consuming , we have developed a square watermelon which worked just great ,and much cheaper than $85 ,come to www.fruitmould.com , order as many as you want and quickly .
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Rihanna4 years ago

Hi,i read your post,it was very good.i`m a plant protection and wanna grow square watermelon.i`m searching about it. about the box i have some problem,you know that commercial boxes are very expensive and dont good for me.could you help me and give me more information and some clear picture?and i cant understand very good that when i must put watermelon in the box to have square watermelon!!!!!!!!!!!!! i`m waiting for your answer;-)

I'm not totally sure about everything you're asking, but as for the last one, the watermelon grows into the shape of the box, kinda like jello in a mold.