Rhymes that I'm considering are:
Five flowers standing in the sun
See their heads nodding, bowing one by one.
Down, down, down comes the gentle rain
And the five flowers lift up their heads again.
One bright flower in my garden grew,
Up popped another and now there are two.
Two bright flowers for everyone to see,
Up popped another and now there are three.
Three bright flowers that I adore,
Up popped another and now there are four.
Four bright flowers prepared to thrive,
Up popped another and now there are five.
Five bright flowers standing straight and tall.
Five bright flowers answered Spring's wake-up call.
I've added a 2nd picture without all the background "noise", but left the first one up because I think it shows the colors better.