Is it possible to remove dead branches from a pandanus tree? What method is best?
It is always possible, indeed advisable, to remove dead branches from any kind of plant. You should use pruners or if the branch is large, you can use a saw. Cut the dead branch as close as possible to the live growth from which it is emerging, without cutting into the live growth. This article has more information on pandanus: https://www.gardeningknowhow.com/houseplants/screw-pine/indoor-screw-pines.htm
I live in San Diego, California. The pandan plants were brought indoor November 1st. They received 10 to 12 hrs. of grow light, watered once a week or when surface is dry. Soil is moist according to moisture meter. 3 out of 6 plants have leaves that wither about an inch from leaf tips inward. It affected all leaves from new leaves in the crown to the outer leaves. The young shoots at the bottom of the mother plants are affted the most. The other 3 plants have healthy dark green leaves but have patchy or yellow spots on them. Please see pictures. Thank you.
They need less water during their dormant period so make sure it isn't getting too much water. Also, it looks like it may have spider mites. To remedy this, spray the top and bottom of the leaves with Neem oil. Here is more:
https://www.gardeningknowhow.com/houseplants/screw-pine/indoor-screw-pines.htm
https://www.gardeningknowhow.com/special/tropical/overwintering-tropical-plants.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-control.htm