what's the name of those common garden bushes that have red small balls and light green leaves?

Question

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Answer 1

It's called a holly bush

Answer 2

Holly (Ilex) is a genus of about 400 species of flowering plants in the family Aquifoliaceae, and the only genus in that family. They are shrubs and trees from 2–25 m tall, with a wide distribution in Asia, Europe, north Africa, and North and South America. The leaves are simple, and can be either deciduous or evergreen depending on the species, and may be entire, finely toothed, or with widely-spaced, spine-tipped serrations. Hollies are mostly dioecious, with male and female flowers on different plants, with some exceptions. Pollination is mainly by bees and other insects. The fruit is a small berry, usually red when mature, with one to ten seeds