What is nectar dearth?

Summer is a pleasant time for many creatures, but for bees, it can be a challenge.

This season is a common time for nectar dearth. As the name implies, a nectar dearth is a time of nectar scarcity. These periods differ from area to area, but they are marked by high temperatures when flowers are dry. The transition between seasons, like spring to summer and summer to autumn, when plants are ending and beginning their respective life cycles, can also result in a dearth.

https://www.mnn.com/your-home/organic-farming-gardening/stories/what-nectar-dearth