The Jerusalem cherry is a popular Christmas shrub with thin, pointed, dark-green leaves. The insignificant, star-shaped flowers are followed by round, half-inch fruits that gradually change from green to scarlet.
This plant is often treated as an annual, but it can be kept growing from year to year if given a harsh pruning each spring. Put it outdoors for the summer so insects can pollinate its flowers. The fruits of the Jerusalem cherry are toxic. Watch out for white-flies.