Please help support this important charity by sharing this with everyone you know...

Please donate £2.50 per strip of 5 sunflower seeds (so £5 for 10 seeds etc), this will cover postage. Please email macmillansunflowers@gmail.com and let me know your name, address and how much you've donated.

Rule of the competition: plant them, grow them! They are easy to grow indoors or out. Measure how high they get when they're at their tallest, we'll take your word for it. There will be 2 winners - first prize for the tallest single sunflower and second prize for the greatest height of all your sunflowers added together, so the more bags you buy the better your chance of winning!

The prize will be a big thank you on behalf of everyone who's benefited from the amazing work that Macmillan do, a small gift from Macmillan and a beautiful big sunflower. The closing date is the last day of August, but if your flowers have begun to wilt by then or you've already put them on your mantelpiece, no problem, give us the greatest height they got to.

Happy growing! Please share this with as many people as you can, there's nothing to stop you having a mini competition with friends and family, just make sure they do it through this official Macmillan fundraiser. And make sure you post lots of photos on facebook.

All proceeds go to Macmillan Cancer Support, thanks for supporting this wonderful charity.