flower
花 centers on the bloom of a plant: a flower, the most visually striking part of many plants.
花 combines 艹 (grass/plant) with 化, which likely contributes the sound and suggests transformation or change, fitting the idea of a plant's bloom.
The top 艹 is a plant, and the bottom 化 looks like a person sitting beside a spoon, as if tending a plant. Picture a gardener nurturing a plant until it transforms into a flower.
For カ, imagine a car decorated with flowers for a parade: car -> カ, and the flowers make it beautiful.
flower; blossom; bloom; petal
fireworks
pollen
bride
cherry blossom viewing; flower viewing
flowering; blooming; blossoming; coming into bloom
bunch of flowers; bouquet
petal
florist; flower shop
cherry blossom
spark
flower garden
elevated walkway through the audience to the stage
(flower) vase
flower bed
bridegroom
bigleaf hydrangea (Hydrangea macrophylla); French hydrangea
floral pattern; flourish; ornament
flower; flowering plant
ikebana; Japanese art of flower arrangement
wreath; garland
flowers and birds
flower offering; floral tribute; laying flowers
red-light district