The selection criteria used were plant vigor, early flowering, foliar appearance, self-cleaning ability and good propagation qualities.

It has two non-thermal infrared bands for sensing plant vigor.

The same can be done for perennials as the summer drought took its toll on plant vigor.

Some very susceptible species may have stems affected with a considerable reduction in plant vigour.

During the winter months, each wine is carefully hand-pruned to maintain proper crop levels and to ensure plant vigor during the growing seasons.

Once the trees are in the field since more than two years, treatments are no more necessary because of plant vigor.

Secondary functions are to increase plant vigor, color, appearance, rooting depth and emergence of seeds while decreasing water requirements, diseases, erosion and maintenance expenses.

Self-pollination limits the variety of progeny and may depress plant vigor.

Oxygen for respiration and light for proper growth are equally important for plant vigor.

The main characteristics of OT lilies are: plant vigor, diversity of colors, fragrance and thick texture of the petals.