If your rhododendron in Victoria, BC, isn't blooming, several factors could be at play, given the area's generally favourable conditions for these plants. Here are seven common reasons why rhododendrons may fail to produce flowers:

1. Insufficient Light

Rhododendrons thrive in conditions with dappled sunlight or partial shade. However, too much shade can prevent them from blooming. They need enough light to photosynthesize effectively and produce flower buds.

2. Improper Pruning

If rhododendrons are pruned at the wrong time, especially in late summer or fall, you might accidentally remove next year's buds. It's best to prune immediately after they finish blooming in spring to avoid cutting off the flower buds set for the following year.

3. Nutrient Imbalance

Excessive nitrogen can lead to lush foliage at the expense of flowers, while a lack of phosphorus can inhibit blooming. Using a balanced, slow-release fertilizer formulated for acid-loving plants can help encourage flowering.

4. Plant Age

Very young rhododendrons, or those that have been recently transplanted, may not bloom until they are fully established. It can take a few years for a rhododendron to start producing flowers as it focuses on root and foliage growth initially.

5. Stress Factors

Environmental stress, such as extreme temperatures, drought, or root disturbance, can affect a rhododendron's ability to bloom. Ensuring your plant is well-watered (without being waterlogged), protected from harsh conditions, and not disturbed excessively can help promote blooming.

6. Bud Damage

Cold snaps in late spring can damage emerging buds, and pests like the rhododendron bud weevil can also destroy them. Protecting your plants from cold and keeping an eye out for pests can prevent bud damage.

7. Disease

Certain diseases, like root rot or powdery mildew, can stress the plant and divert energy away from blooming. Proper care, including planting in well-draining soil and avoiding overhead watering, can reduce the risk of diseases.

To encourage your rhododendron to bloom, focus on providing optimal growing conditions: sufficient but not excessive sunlight, proper watering, and fertilization tailored to its needs. Also, ensure to prune at the right time and protect it from environmental stresses and pests. With the right care, your rhododendron should thrive and bloom beautifully in Victoria's mild climate.