Answer: Assuming you have the patented form Xanadu, the plant should mature to about three feet high by three or four feet wide, although it might get a little bigger than that. It should also be self supporting (although arching and spreading outward and downward somewhat so it conceals the rim of the container is normal) as long as it is in bright enough light. Staking will interfere with the natural shape and the plant's exposure to the light, so it probably would not be a good thing to do. If it seems to be growing leggy and loose, try either gradually increasing the light it receives and/or reduce the amount of nitrogen fertilizer you are giving it. (The lower the light, the less fertilizer it needs. The brighter the light, the more compact the plant.) Commercially, it is propagated by tissue culture. You should be able to divide it (taking a section of root and its corresponding stems) or if you prefer, gently dig out one of the offsets at the base of the plant without overly disturbing the parent. Here is some additional information from the Monrovia web site you may find interesting.
This patented hybrid philodendron is a smaller, more adaptable sized form of P. selloum. The genus falls into the same family as the calla lilies and contains about 400 species mostly native to tropical American including a number of epiphytes. It was classified by Austrian botanist Heinrich Schott, 1764-1865 who chose the name from the Greek for tree-loving, to describe the many liana species. This species has formerly been synonymous with P. bipinnatifidum, and P. sellowianum, and often confused with a different species P. imbe. These plants are very similar in appearance to species in two other closely related genera: Monstera and Epipremnum, all of which produce leaves that are markedly different in from their mature leaves. It is indigenous to southern Brazil and Paraguay and is the most cold hardy species of the entire genus.
Enjoy your plant!
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