Yucca Outdoors, Flowers Every Year, None This Year Until November 9 Spikes Appear Will It Flower, Is It Climate Change Affecting.

Question

We are in North Cambridgeshire U.K. Hve had this plant in this position 18 years. spikes are up to 4 feet.

Answer 1

No, likely the soil is depleted of nutrients. Possibly needing phosphorus and potassium. If the area gets fed, regularly, then it could be a nitrogen build up. This can lock out phosphorus and potassium. Test your soil for deficiencies and pH imbalances and correct as needed.

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

https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plant-doesnt-bloom.htm

Something else to consider will be the type of Yucca. Some varieties only live a few years, while some live 50 or more. If you have one of the more "specialized" cultivars, then it may be nearing the end of its lifespan. Fortunately, testing soil can rule out age if you notice deficiencies.

This collection of articles will offer more information on Yuccas:

https://www.gardeningknowhow.com/ornamental/foliage/yucca