Thai Morning Glory

The wife has been trying to grow this in the greenhouse and it's come along quite well but seems to have slowed almost to a stop recently.

Some are about 2-3 inches tall, but some smaller ones look almost a little dry, maybe with a little brown on some leaves (they are kept plenty moist).

Would they benefit from some plant food? Natively they grow in warm/moist conditions, almost like weeds in some countries.

Have you noticed any improvement since using the fertilizer?

I keep trying to persuade my wife but she  is still quite insistent that they be totally "organic" 

I used an organic feed and yes a slight improvement,but I am putting the slow growth  down to drop in temp.

We got our seeds from China (where my wife is from), a bit naughty I know  . You can buy the plants from our local asian supermarket as well, quite easy to cook and rather tastey.