This climbing woody deciduous vine is a favorite of mine because when it likes it's environment, it is unstoppable, i.e. vigorous. Full sun, with moist, pH neutral, well drained soil is best, and it has the most beautiful small white lightly fragrant flowers in late summer. Great for a fence or wall. Needs pruning otherwise will take over your life. Look up which Clematis you have, (there are many), and the type of Clematis will determine the type of pruning you need to do.
Conditions: shade or protection at base, full sun higher up on foliage
Bloom: Early Spring-Fall depending on type
Size: vigorous woody climber