Tissue Proliferation

You might notice gall-like crown growths on micropropagated rhododendrons that look like wounds with excessive tissue formation. This physiological disorder stems from tissue-culture propagation imbalances, not infection. Plants often recover over time; growth is rarely severely affected. Rogue plants if desired, but provide good cultural conditions. The problem has largely disappeared with improved propagation techniques.

Provide good, nonaccelerated cultural conditions for rhododendron production. Affected plants may be rogued if desired.