Many, many years ago I always combined houseplants because I liked the looks of full pots and different combinations but it got to be too much when some plants grew so fast that the roots crowded out other plants in the container making it necessary to repot. I've always been a rather lazy gardener (even with indoor houseplants) and some of the plants in combo containers would end up dying because I'd let them go so long without repotting. I do sometimes have succulent bowls with plants of like size and need planted together.
