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.
Old-fashioned lupines, or Lupinus arboreus, are easy to grow. Established plants can be expected to produce large, showy spikes that emerge in early summer for years to come. They're tall and impressive, and attain a mature size of up to 3 feet tall and 3 feet wide. Nearly carefree, lupines will benefit from a little pruning during the growing season.