The key to this answer is the plants turning yellow. Lack of fertilizer, cold weather or not enough water are just a few things that can cause foliage to yellow. First I would add Osmocote to the soil of any hanging basket even if you are watering with a liquid plant food every couple of weeks. As the plants grow they require more fertilizer. Second if the water pours through the bottom you may not be getting the parched soil saturated with water. Try watering once, letting them drain then watering a second and a third time until the pots feel heavy and the soil is saturated. Third, they type of plants in those baskets will determine how they look after a long, hot summer. Super petunias, ivy geraniums and foliage plants like Dusty Miller last longer than regular petunias, lobelia and many other annuals. With these tips your hanging baskets should remain green and in bloom until the first hard frost - usually in mid October in your region. Keep growing, Marianne Binetti