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Best Fertilizer and Frequency for Mandevilla?

westes Zone 9b California SF Bay
7 months ago
last modified: 7 months ago

I have a container Mandevilla that is coming out of Winter looking listless. It is not growing and has no flowers. I guess this thing needs constant fertilizer. What would be the best options for fertilizer, and how often should I be fertilizing during the flowering season? I want this thing to cover a very large trellis.

The first two photos show what the plant growth currently looks like: no new growth and old leaves just slowly dying away. The last photo shows the plant last Summer. My guess is that it still had some fertilizer from the original potting soil last Summer.

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