Shirl is doing a meme about what three plants you would want with you on a desert island, with the caveat that the food crops are already available, you don't have to worry about the climate, and any plant will grow.
I'm such a practical sort that my first choice would be a large bamboo plant (though it might already be available since people do eat bamboo shoots). I could construct fences, houses, furniture frames to make my life more comfortable. I could make wind chimes and flutes to feed my soul. I could make fish spears to supplement my diet. I can't come up with a more useful plant. Plus I love the look of bamboo groves.
My second choice would be rattan (one of the thinner species) to be used for basket weaving, ties for my bamboo construction, comfortable seating, even carpets. The berries also make a nice peach dye. It isn't a pretty plant, it is just practical, but hard to beat for its usefulness.
I thought about using my third choice for some clothing, if I did it would be flax (cotton is much harder to process by hand), but I decided to pick a frivilous plant that would make me smile. Flowers are wonderful, but to me the scent of a plant is much more important. I grow box in my garden just so I can brush by it and smell it. No, box is not my pick. Jasmine is my pick. It is one of my favorite scents and I can't grow it here in the north, so I'll put it on my island.