Flowers = praise and glory, a fragrant offering to Christ.
Matthew 6:28 Consider the lilies of the field, how they grow; they toil not neither do they spin.
The joyful flourishing of Christ’s kingdom – Isaiah 35:1 The wilderness and the solitary place shall be glad for them; and the desert shall rejoice, and the blossom as the rose. I shall blossom abundantly and rejoice even with joy and singing.
Plants = people, churches or nations.
Psalm 144:12 May our sons in their youth be like full-grown plants, and our daughters like cornerstones polished.
Isaiah 53:2 For he shall grow up before him as a tender plant, and as a root out of a dry ground.