burgeon
/ˈbɜːrdʒən, ˈbɝːrdʒən/Definitions
1. verb
to grow or develop rapidly, especially in a sudden and vigorous way
“The young plant began to burgeon with new growth after the spring rains.”
2. noun
a new or sudden growth, especially of plants
“The gardener was delighted to see the first signs of a new burgeon on the rose bush.”