I'm no expert but.. I live in an area that too much sun would burn the leaves not make them yellow.. sounds like some sort other problem.. What name is the Brug and do the leaves drop off?
Chena

Mine do the same. I assume they are in the ground? I have used sulfur slow release but all soils are different. Mine in strong sun have smaller leaves and do not grow as well as the ones in shade. Maybe to much water. I do not have that problem in the summer. It is impossible to water them too much. Sandy soil.

Jim

gee8ch, how long have these been in the same pot and dirt?
If more than 3 years you should try changing the dirt and clean the pot, then try some lime to sweeten the soil on them.

My Brig too is about 3 weeks old -- bought it about 2 feet high. Was doing Ok until last week when suddenly all the leave have drooped. They don't seem wilted or anything -- water also adequate -- seems to have happened after I sprayed Triacontanol on all my plants -- but only the brug affected this way. Receives bright light all day -- no direct sunlight any time of the day -- leaves have been light green from the beginning and had even sprouted a couple of new ones. Could this be due to over watering or the triacontanol?

volcanohts, I'm betting on the spray. Just strip them all off and if the stalk looks good the leaves will grow back in no time. Just be careful how you spray and when.