It's pretty tricky! You need to use extra carrots from the bio lab. But before you use them you need to put them through the shredder in the bio lab.
There are three paths that I know of that can solve the maze.
🟤 = raisin
🟠 = carrot
🟢 = pea
🔹 = seed
From memory, I think this will work: (I haven't got it in front of me to confirm, so might be a mistake):
🟢🟤🟠🔹🟤🟤🟤🔹🟠🟢🟤🟤🟤🟤🟤🔹🟠🔹🟠🟢🟢🟠🟢🟠🟢🟤🟤🟤🟢🟠🔹🟠🔹🟤🔹🟠