Fishtail palms can be propagated from seed. Flowers on this palm tree contain both male and female parts so that a single plant can yield viable seed. To sprout palm seed, keep it warm and moist in a small pot for six to eight months. More commonly, plants can be propagated using suckers from the base of the mother plant. Remove them carefully with a bit of root and expect them to recover for several months before new growth emerges.Re-pot in the spring while they are young. In general, fishtail palms are slow-growing and will only need repotting every other year or so. It may not be possible to re-pot larger palms. In this case, scrape away the top several inches of potting soil and work new soil into the pot. Add plenty of porous drainage material to encourage good drainage.