Flowering Bushes in Zone 4

Yellow Flowers

• Zone 4 is the coldest zone in which the shrub rose grows. Cultivars such as 'Radsun' and 'Radsunsar' feature yellow flowers. These bushes grow to 4 and 10 feet respectively. The shrubby cinquefoil is another bush known for its yellow flowers, with the blooms resembling buttercups. Shrubby cinquefoil grows to 4 feet and serves as a foundation plant or is used in shrub borders. 'Golden Lights' is a deciduous azalea hybrid for Zone 4. It has yellow flowers, blooms during May and grows between 3 and 6 feet tall.

Red Flowers

• If you're seeking a bush with red flowers suitable for Zone 4, the weigelas and the roses have several representatives. Weigela hybrids such as 'Minuet', 'Victoria', 'Red Prince', 'Rumba' and 'Tango' all possess red flowers. 'Betty Boop' is a type of floribunda rose bush with red flowers, while the 'Hansa' and 'Morten' cultivars of the rugosa rose also have red flowers as a common trait. Tree peony hybrids such 'Shimna-Nishiki' and 'Kronos' also have red flowers.

Blue Flowers

• Three separate types of lilac hybrids have blue flowers for those in Zone 4 who prefer this color. One is the 'Wedgewood Blue' hybrid of the common lilac -- a species growing to between 4 and 6 feet high. Another is the taller 'Agincourt Beauty' cultivar, capable of growth to 15 feet. The 3- to 5-foot high 'Little Boy Blue' also turns out blue flowers. The lead plant's clusters of blue flowers develop on spikes above the 3-foot-tall bush.

Orange Flowers

• Assorted species produce orange flowers and handle the growing conditions within Zone 4. The Japanese quince hybrid 'Alpina', growing to 12 inches, works well as a foundation plant or in rock gardens. It grows in most soil types and its fruits are used in jellies and preserves. A shrubby peony known as 'Tessera' has large orange petals, making its flowers conspicuous and showy. A Japanese species, furin-tsutsuji, has orange flowers shaped like bells.