the most part, palms should be trimmed at least yearly if
not more often (resorts trim monthly to keep a perfect looking
tree). Most palms look best if trimmed to the horizontal point,
or 90 degree point. Never should the palms be trimmed back
past the 45 degree point. Always trim the palms back to the
point of termination on the trunk below the last spines (if
any). Clustering palms such as Phoenix reclinata or Chaemerops
humilis can be trimmed to a solitary structure- cutting off
all the suckers at the base- or more preferably a clumping
structure whereby one would select the best 5 or seven trunks
and encourage them while cutting off all the remaining suckers.
Many patient years of this clumping structure trimming technique
can yield amazing multitrunked trees of very high value.