June 8, 2012
i suppose it might be due damping. It might be due to excess watering. As a solution nothing much can be done except to be careful while watering dont water until you feel the media to be dry when you dig your fingers 2-3 inches below the media. You can try this though i am not sure whether it will work - try giving the soil a bit of aeration by drilling holes around the plant deep enough and allow it to dry in sun.
June 22, 2012
February 14, 2012
Looks like over watering is the issue here.How often do you water them?
If you are growing this in a pot, I would suggest you take out one plant (place the pot upside down, gently tap the bottom of the pot so the soil loosen up, then gradually pull out the plant), check the moisture/water level.
While preparing the pot for planting, make sure either you place few stones, broken tile pieces near the drainage hole. Also add 1/3rd sand to the potting soil.
If the plants are on ground, stop watering for few days, see if things improve.
NOTE: Plants don't need water, they need moisture.