Why Are My Passion Flowers So Small This Year?

Question

Last year, my first year owning the vine the flowers were huge. Now they are blooming but so small.

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Answer 1

These can grow in remarkably poor soils, but usually do better when you fertilize them. This needs to be pretty specific, though. You should, usually, feed with a fertilizer twice as high in phosphorus as nitrogen. You won't need much potassium.

More nitrogen then phosphorus will cause the green growth, but poor flowering. Alternatively, if your soil is too acidic, this may lower the availability of phosphorus.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm

https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-vine-fertilizer-tips-on-fertilizing-passion-flowers.htm