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Pick your vine. Pollinate the pumpkin blossoms by hand. Identify the male and female plants to pollinate by hand. Pull the petal from the male blossom.
The strongest and thickest vines often produce the largest pumpkins. Monitor your vines and see which one seems to be growing the fastest and thickest. Pollinating by hand is the preferred method but if you don’t have the time or the energy, it is a pretty safe bet that the bees will do most of the pollination for you. The flowers generally show up in late July. As in every form of reproduction, there is a male and female pumpkin counterpart. Do not begin pollinating until you the plant has roughly 200 leaves.  The female has a small pumpkin at the base and no pollen inside the flower. To achieve the strongest female plant, you can break off the first female flower and wait for the second or third to grow (the strongest females grow when the vines are roughly 10 feet long, or longer.)    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/5a\/Grow-Giant-Pumpkins-Step-10Bullet1.jpg\/v4-460px-Grow-Giant-Pumpkins-Step-10Bullet1.jpg","bigUrl":"\/images\/thumb\/5\/5a\/Grow-Giant-Pumpkins-Step-10Bullet1.jpg\/aid1325738-v4-728px-Grow-Giant-Pumpkins-Step-10Bullet1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}  The male will have a stamen inside the flower. The stamen will be covered in pollen. These male flowers generally show up before the female flowers do.    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/b\/b9\/Grow-Giant-Pumpkins-Step-10Bullet2.jpg\/v4-460px-Grow-Giant-Pumpkins-Step-10Bullet2.jpg","bigUrl":"\/images\/thumb\/b\/b9\/Grow-Giant-Pumpkins-Step-10Bullet2.jpg\/aid1325738-v4-728px-Grow-Giant-Pumpkins-Step-10Bullet2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"} Only do this when a female flower grows from the largest and healthiest vine. Pulling the petal will help to expose the pollen needed for pollination. Rub the pollen stamen on the blossom of the female flower. This step is most successful if completed before the middle of July. This will ensure that the pumpkin has ample time for growth.