It’s not just your outdoor plants that may have been struggling with the hot weather this summer. And if this is the case in your household, don’t worry, as plant experts have revealed five heat-proof houseplants that will happily flourish in a hot south-facing window. In my experience, the best houseplants can really make a house feel like a home. As the UK experiences a record-breaking, hot summer, experts are recommending these five houseplants that thrive in warm, sunny spots. Ponytail palm(Image credit: Getty Images/ Yobab)Ponytail palms can go weeks without being watered, making them one of the best houseplants for forgetful plant parents.