Antonyms of deciduous :
evergreen, semi-evergreen, half-evergreen, lasting, cone-bearing, persistent, coniferous, lifelong, continuing, durable, imperishable, indefectible, indestructible, ceaseless, dateless, deathless, endless, enduring, eternal, everlasting, immortal, long-lived, permanent, perpetual, timeless, undying, unending.
Examples of usage:
I had rather Justin beat me into submission and mental tranquillity and that I bore him an annual- probably deciduous- child. "The Passionate Friends", Herbert George Wells.
Diaphragm thin; tendrils few, or if present, weak, usually deciduous. "Manual of American Grape-Growing", U. P. Hedrick.
Here a scattering group of tall pines, a few thick hemlocks, and a young growth of miscellaneous deciduous trees fill up the space between two rather steep banks. "Butterflies Worth Knowing", Clarence M. Weed.