Hmmm, the other plants may be crowding out the resources that are needed to keep these two alive and healthy. Try this: pour a mixture of 1/5 gal. water, with 16 oz. sour milk, 4 oz. sugar, and 1 -2 teaspoons of baking powder (not soda), at the base of the ailing plants. It should only take one application, though in rare cases, it may take two. You should see results in about 12 to 15 days after application. -Birdy