Well it depends on how close to that pine you plan o plant. Nothing will do well directly under a pine or within the perimeter of one. It will be too shady and there will be too much root competition. If this is what you are thinking of doing, we recommend you mulch under the tree and add color with low pots or planters. If you are going to plant outside the perimeter of the tree, but close by, I'd go with annuals since if you plant perennials the pine will eventually get bigger and compete with them. I don't know how much sun this area gets, but you can look at both shade and sun-loving annuals on our Plant Encyclopedia. Do an Advanced Search and plug in your criteria and you should get a nice list to work from.