How to trim a tall hedge
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Palm trees are vulnerable to several fungal diseases that enter through wounds in the trunk and can kill the tree. To prevent disease spread, clean your pruning tools by soaking them in a solution of half household bleach and half water for five minutes before use. Use conventional straight pruning saws rather than chain saws, which cannot be adequately cleaned. Clean the tools again before moving from one palm to another. Palm trees often have stout spines and sharp leaf edges that can cut skin, so wear long sleeves, long pants and gloves. Use pruning saws for larger cuts and pruning shears for slender growth.
Some palms are self-cleaning, which means that the old leaves fall off by themselves. An example is the foxtail palm (Wodyetia bifurcata), which thrives in U.S. Department of Agriculture plant hardiness zones 10 through 11. Remove dead or dying fronds, especially on the tall, self-cleaning royal palm (Roystonea spp.), which grows in USDA zones 10 through 11, since the heavy fronds may cause injury when they drop off. When palm trees become too tall for you to safely prune yourself, call in professional help. Resist the urge to remove green, living leaves. Each palm species has a set number of leaves for optimum health; the palm leaves that die each year are replaced by an equal number of new leaves forming in the crown. If you must remove green leaves, don't remove
more fronds in a year than the tree produces during that time. Fronds that point horizontally outward or point upward shouldn't be pruned. Don't wound the palm trunk by pulling or tearing off leaves, or cutting into the trunk with a machete when trimming leaves.
Flower Stalk Pruning
Prune off flower stalks except for palms from which you might wish to harvest fruit, such as date palms (Phoenix dactylifera), which grow in USDA zones 9 through 11 and have invasive tendencies in some areas. Some palm flowers, such as royal palms, are valued for their fragrance, so you can allow flowering, removing the stalks before fruit formation. Removing stalks enhances frond growth because the plant's food isn't diverted to produce flowers and fruits, and also helps prevent litter problems due to falling leaves, fruits and stalks. Use a sharp, bleached pruning saw with an extension if needed to trim away flowering or fruiting stalks.
At times, some palm species may produce so many offsets that they outgrow their containers, obscure visibility along driveways or become too large for the space allotted to them. Use a clean, bleached pruning saw to remove offsets while they are young so they don't leave large pruning scars. Areca palms (Dypsis lutescens), which grow in USDA zones 10 through 11, send up new stems from underground rhizomes. To thin this type of growth, use a sharp, bleached pruning saw to cut off stems close to the soil.Source: ehow.com