Roses love banana peels. They rot quickly, releasing minerals roses need such as calcium, sulfur, magnesium, and phosphates. Just cut them up and mix them in the soil at planting time or anytime you want to give your roses a boost. You can also make a banana peel tonic for use after the plants are established.
Ground layering is an easy way to propagate hydrangeas. First, cut a notch in one of the branches of the main plant or scrape a little bark off the underside. Take the same branch, bend it over, and bury it in the ground. Make sure at least one leaf node will be underground.