So far so good this record breaking heat wave all summer, but now my Bouganvillea is dropping leaves. We water once a week and it is hanging from the porch joyce facing south. My friend is also having a problem w/dropping leaves but her plant has tiny bug-like holes. Any idea why our plants are dropping leaves? She has the same kind of plant 6 ft. away in full bloom! She has been watering every day! Thanks.
Most likely this is attributed to the excessive heat. Many plants will shed their leaves in order to conserve water, even if you are watering daily. With high temperatures, much of the water actually evaporates before reaching the root system. This is why soaker hoses work well for watering--it allows for the water to penetrate deeply in the soil. High temps can also cause the soil to compact, making it more difficult for any water you do give the plants to penetrate it, thus much of the water runs off. The plants should regrow their leaves once the temps begin to even out some, so just keep doing what you're doing but be