Answer: The smallest willow is Salix caprea, or goat willow. This is a small tree growing 15'- 20' high with a 12'-15' spread. Most other willows reach heights of 60'-100' with an equal spread! If you cut branches for crafts, you can keep the goat willow on the smallish side. Willow roots will actively seek water, so, just to be on the safe side, plant well away from septic systems and drainfields.
Q&A Library Searching Tips