At least in they project the plant would glow forever. In this project they add the reactives submerging the leaves in a liquid with nanoparticles that have the reactives, so it locks like they will glow only once.

Also, in spite of the photoshoped tree and the photo that has the brightness so high that the noise level is evident

> The light generated by one ten centimetre (four inch) watercress seedling is currently about one-thousandth of the amount needed to properly read by, but it was enough to illuminate the words on a page of John Milton's Paradise Lost.

this generates a tiny amount of light, don't expect to use it to illuminate the streets like they hope in the article.

They (Taxa Biotechnologies) also raised money on WeFunder, where I invested a little bit. They switched from glowing arabidopsis to glowing tobacco plants because of problems with the genetic engineering, then pivoted to moss engineered to generate scents. Then they ran out of runway and that was that

I'm still fond of the idea, even it was only ever going to produce a relatively weak decorative glow. I'm sure it will pop up again in some startup eventually, now that we have CRISPR.