This text has been copied from http://gamesontheweb.blogspot.com/2007/03/sprout-walkthrough.html
“After the intro, click on the coconut to float across the sea.
Learn how to become a dandelion, then click on the dandelion to float inland. Click on the Coconut to roll back down into the depression. Learn how to become a fruit bush.
Choose dandelion to float back up. Choose fruit bush to attract the sheep. He’ll go back to the top of the hill (thought you’d just get ‘dropped’ off on the other side, didn’t you?). Choose dandelion and you’ll get stuck on the back of the sheep. He’ll carry you back home when he gets called in to his pen.
If you want to, you can turn into a fruit tree to make your way into the desert and get fried. But you get stuck and have to float back, anyways. So, I’m going to skip that part.
Choose dandelion (oh no! you’re flying backwards!). Click on coconut. Note how you hit the dam? Repeat this process until the dam breaks. This will cause a river to flow into the desert. If you don’t do this, you can’t turn into a fruit tree in the desert, you just burn up.
Now you can successfully turn yourself into a fruit tree in the desert. The bird flies down and eats you and ‘drops’ you off on the top of the cliff.
Choose coconut to learn how to be a vine. Choose vine. Then choose fruit tree. The bird on the left steals you away and puts you back at the top of the cliff. Choose vine to fling him away (Not exactly grateful for saving you from the desert?).
Choose coconut. Thought you’d make it across didn’t you? You end up rolling back under the branch. Choose coconut to push the branch up. Then choose vine, then fruit to get back to the top of the hill. Choose coconut to fly across the water. Then choose acorn to win."
I edited this a little bit because it was writed wrong. And congrats!