There are a lot of fynbos species which are garden friendly. Stick to these species and you will get good results. Remember most mountain fynbos species like acidic well drained soil. You can improve your drainage and acidity my adding a fine pine mulch or chopped pine needles to your soil when planting. Remember to mix them into the soil well. Stick to speices like Leucadendron Safari Sunset, Leucospermum cordifolium, Erica baccans, Watsonia bulbifera or any of the restio family (grasses). These are the basic elements of Cape Fynbos.