blossom into (something)
1. Of a plant, to bloom into a particular form. I can't wait for the flowers I planted to blossom into beautiful colors and brighten up our yard.
2. Of a person or thing, to quickly grow and mature into a particular type of person or thing. It feels like my kids blossomed into adulthood in no time at all. I had a much easier time writing my second novel—my idea blossomed into a fully fledged plot almost overnight.
blossom into something
1. Lit. [for a plant] to develop into full bloom. The bush blossomed into beautiful red roses. Imagine this brown old bulb blossoming into a lovely flower.
2. Fig. [for someone or a concept] to develop into something. She blossomed into a lovely young lady. The idea blossomed into a huge real estate development.
Also, blossom out. Develop, flourish, as in She's blossomed into a fine young woman, or His business has blossomed out and he's doing well. [Second half of 1800s]