Do you soak your seeds before you plant? Soaking seeds before planting helps you to break down the seed’s natural defenses against what it expects from Mother Nature, which then allows it to germinate faster.
Use chicken wire to encourage a Clematis (or other vine) to clamber up a tree. HOWEVER - be careful to leave some room for the tree trunk to grow thicker, check it every year, and don't plant an aggressive vine that might strangle the tree.
Make seed Tapes plain white paper towels scissors, a yardstick, a pencil, white glue sealable plastic bags seeds, both flower and vegetable seeds work well with this system tweezers (optional) food color if you want to color code your seed tapes (optional)