Here are some spring-themed birthday sentiments that you can use in a birthday card:

  1. Wishing you a blooming beautiful birthday!
  2. Have a sunny, bright and cheerful day. Happy Birthday!
  3. Wishing warm wishes on your birthday!
  4. May this new year be as fresh and promising as the arrival of spring. 
  5. Wishing you a life blooming with happiness.
  6. May your year ahead be filled with positive changes and fresh surprises.
  7. Wishing you a day as bright and beautiful as the colors of spring. 
  8. Happy Birthday to someone who brings sunshine into our lives.
  9. I wish you abundant growth in happiness, love, and success. Happy Birthday!
  10. May your birthday be filled with the fragrance of flowers, the warmth of the sun, and the beauty of nature.