Choisya - No flowers on one plant?

I purchased three Choisya Ternata Mexican Orange Blossom plants last year and they are thriving in pots. However, only two of the plants have flowers. Any idea why one of the plants is flowerless?

 

Choisya is my favourite shrub, the flowering time is late April to late May. You may be a bit early...

 

Mine is just coming into flower now.
Are all three pots in the same area, it could be that the one without flowers gets less sun.

 

All of the three pots are in the same area, south facing and sheltered.

 

Just had a look at my Choisya, it is just coming into bud now. Great little shrubs choisya

 

One of my Choisyas......14’ tall. Wish I could post the scent it is sublime

Jazzy, it will settle down to flowering. Don’t overfeed or overwater then it will be kind to you