I have a S.caradonna that is about 4 or 5 years old. It grows beautifully and then when we have a heavy rain it falls. It was doing so good this year, then it collapsed. Yesterday evening we had more heavy rains and it looks even worse today. Is this normal for salvia (caradonna). Is there something I can do to prevent from happening next year? If in early spring I pinch it back will that give it more support, when it blooms?