A number of problems can cause a plant's leaves to turn yellow, such as too much sun, lack of nitrogen, iron chlorosis or pest infestations, depending on the type of plant and its current habitat. number of problems can cause a plant's leaves to turn yellow, such as too much sun, lack of nitrogen, iron chlorosis or pest infestations, depending on the type of plant and its current habitat.
Plumbago plants, also known as plumbago auriculata or cape leadwort, grow well in warm climates. They are a great addition to a garden, as they attract butterflies and are ignored by deer. Plumbagos are bushy plants that can grow 3-10 feet high and just as wide, according to Gardening Central.
Marigold â the smell of marigolds is reported to be repellant to aphids. The flowers also attract hoverflies â which are considered beneficial as hoverflies are predators of aphids. Borage â Borage attracts bees and predatory insects, and repels many insect pests. It also has lovely blue flowers. Considered one of the best companion plants â helpful for many plants, especially strawberries, tomatoes and cabbage. Carrots. Carrots inter-planted with alliums (onions, leeks, garlic) confuse onion and carrot flies.