My forsythia are certainly not about to pop. The cooler weather the next few days will slow that process. I commented the other day that I saw a single forsythia in full bloom but other forsythia's on the same street didn't even have buds, just like mine. I think those are different cultivars. I'm still planning on going by the same forsythia bushes that I've been using for nearly 20 years to keep things relative and they are not about to pop.