Summer Sweet or Clethra. Intensely fragrant, white or pink spikes appear for several weeks in summer. Give an acid soil and plenty of water.

   Viburnums. A dependable group with attractive leaves, white flower clusters (some fragrant as V. carlesi and carl-cephalum), and colorful berries. The large doublefile viburnum has flat flower heads along horizontal branches. The Japanese snowball is a showy double form.

   Tender shrubs-camellias, gardenias, lemons, and oleanders-are important in the container garden. Here are just a few of the many possibilities.

   Camellias. Outstanding evergreen shrubs for containers. Acid-loving, they need winter protection in the North. Where hardy, tubbed plants provide accent at doorways and on terraces. Waxy blooms in various colors appear from fall through spring against shiny, dark green leaves.

   Chinese Hibiscus. Colorful favorites in Florida, Southern California, and Hawaii, with shiny, heart-shaped, coarse leaves and dramatic hollyhock-like flowers in pink and rose, white, peach, orange, and yellow, single and double. Plants can take hard pruning.

   Citrus. Many shrubby kinds, all good for containers, they can be trained as trees or shrubs. In Europe, oranges and lemons are ornamental features of estate and palace gardens. Small kinds are charming in pots.

   Hollies. Several tender kinds, like the evergreen Chinese, Dahoon, and Yunnan hollies, are attractive for both leaves and fruits.

   Holly Osmanthus. A choice evergreen with lustrous leaves and scented yellow-green flowers. Good for small, neatly clipped hedges. Consider the variegated form and the variety, Fortune's Osmanthus, with larger leaves to four inches. Indispensable for containers in the South and the West Coast.

   Hydrangeas. Fine for tubs, these plants have huge, showy, long-lasting flowers in pink, blue, lavender, and white. Plants are deciduous and require cool storage in winter, though they take temperatures to zero without bud killing if cold spells are short. They need rich, hu-musy soil, abundant moisture, and are recommended for shade. The blues have an especially cool appeal on hot, summer days.

   Japanese Aucuba. Evergreen, popular for pots and planters in Europe, especially in front of cafes in Paris. A delightful variegated form is the Gold-Dust Tree. It is best in shade or part shade, for leaves turn yellow in full sun. Red berries appear in fall.

   Nandina. Oriental shrub, with fine-cut leaves and clusters of red berries, sometimes called Chinese sacred bamboo. Berries last long after the delicate, compound leaves fall.

   Oleander. A traditional evergreen tub plant with long, narrow, shiny leaves and single or double fragrant flowers. Requires a frostproof, well lighted place in the North in winter. Oleanders can be trained as standards, as they are often seen on streets in Greece.