Here's a little info from my files:
(Hawaiian Umbrella Tree) is a tropical and is very low maintenance.
Light - Does well in low to medium lighting conditions.
Temperature - Room temperature (65 - 75 degrees) is OK. Keep in mind this tree is from Hawaii so don't expose it to temperatures below 50 – 55 degrees for an extended period of time.
Water - They like to be on the dry side but be sure that the soil doesn't dry out completely. If you notice that some leaves are turning black and falling off it’s a sign that you’re over watering. If the tips of the leaves appear wrinkled or the leaves are turning yellow the plant has gotten too dry.
Fertilizer - A weak solution (1/2 strength) of plant fertilizer can be given through the winter and then use a full strength solution in spring, summer, and fall. Be sure to follow the directions on the fertilizer when mixing.
Something like Miracle grow plant food will work fine for this tree.
Care is not difficult with this tree; it is quite forgiving (with the exception of cold). Likes standard feeding during the growth season, and daily water. Plant is well draining soil mix. Reduce root ball in early spring when all frost danger is past, chop to desired height at the same time. It is a good idea to leave at least two leaves on the growing tips, as back budding can be slow after the root reduction. Check the archives for a plethora of solid mixes for a Tropical.
Cutting should be rooted in a glass of water in a warm/light location. You'll have good success, but it takes a while, don't give up on the cuttings. I've never seen them in a group planting, but you can give it a shot. You will need to pinch the apex leaf many times before branch buds appear below, until then they may look like a stick with a growth on top. All back buds appear where past leaves have been. When you cut the leaf, just cut the long stem, and about a week later let the base yellow and fall away, this way you wont damage the future bud.