Beautiful bushy plants growing at the beach, southern Mexico

First grow of two plants was going well. Then, growth seemed to stop, and leaves started to curl. A few lower leaves started to brown, then the buds began to brown. Finally noticed a white substance on the stems, and within 2 weeks, all buds died and the rest of the leaves browned and died.

Plants were 12 weeks old, and about 12" high. Lovely green and bushing out until the disease took over. PH in soil was 6.5.

We live at the beach in southern Mexico

1 Like

Not any kind of an expert, but is it possible they got any ocean spray ? The white stuff almost looks like salt.