Yes, grew is a Scrabble word!

Verb

1. Pass into a condition gradually, take on a specific property or attribute; become

2. Become larger, greater, or bigger; expand or gain

3. Increase in size by natural process

4. Cause to grow or develop

5. Develop and reach maturity; undergo maturation

6. Come into existence; take on form or shape

7. Cultivate by growing, often involving improvements by means of agricultural techniques

8. Come to have or undergo a change of (physical features and attributes)

9. Grow emotionally or mature

10. Become attached by or as if by the process of growth