Weigela does not bloom

Question

Planted in full sun, especially in the spring.

Answer 1

This could be due to high Nitrogen in the soil. This will cause lots of green leaves and no flowering.
You can add phosphorous to promote flowers. Bone Meal is a good way to do this.

Also proper pruning. Weigelas bloom on old wood.

Here are some links to help you.

https://www.gardeningknowhow.com/ornamental/shrubs/weigela/pruning-weigela.htm
https://www.gardeningknowhow.com/ornamental/shrubs/weigela/growing-weigela.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm