Reabsorbtion. Occuring more commonly within the nephron system than filtration, this is a form of active transport which takes the the useful substances for the body from the tubules and places them back into the blood filled capillaries.
Oleanders are shrubs, but they are _big_ shrubs. Most of the varieties in cultivation top out at 8 to 12 feet tall and about the same width. The wild form, and some of the older cultivars used for windbreaks top out at 20 x 20 feet.
Growth Rate. Rose of Sharon has a medium growth rate, meaning that it grows approximately 13 to 24 inches a year. A mature Rose of Sharon bush can grow between 8 to 12 feet tall with a 4 to 10 foot spread. The shrubs have a compact, upright growth pattern when young, but tend to spread out as they age.