OK, it's time for your math class. Leonardo Pisano Fibonocci was an 11th century mathematician who brought the Arabic numbers we use today to the merchant world to replace the cumbersome Roman numerals. He also pondered (mathematically speaking) the successive reproductive growth of rabbit populations. (Only a mathematician...) He applied an old Indian Hindu numbering sequence to develop a formula calculating the count over time. The Hindu sequence is what we (our Western-centric society) now call the Fibonocci sequence. The sequence adds the previous two numbers in a series to arrive at the next one: 0,1,1,2,3,5,8,13,21,34...
Innovation Factory, the image is a "Yellow Chamomile head showing the arrangement in 21 (blue) and 13 (aqua) spirals. Such arrangements involving consecutive Fibonacci numbers appear in a wide variety of plants. Plants produce their leaves and seeds from a growth tip that spirals around the plant or center of the seed head as it goes -- the most efficient way to pack seeds into the seed head... You get the closely packed Fibonacci spirals of seeds, with the number of clockwise and anticlockwise spirals at any point on the seed head a pair of successive Fibonacci numbers." Sure enough, my coneflower has 13 spirals in one direction, and 21 in the other.
Writing of coneflowers (Echinacea), I offer some observations on the three types in my garden: native Echinacea purpurea, Sundown of the Big Sky series, and Coconut Lime. The original echinacea purpurea are the most drough-tolerant, but the flower petals can droop, leaving a large prominent seed head. Bumblebees love them, and so do the goldfinches who perch on top and chow down. They are taller than the others with the largest flowers and largest seed cones -- making it easy for the finches to fly in for a snack.
The flowers can vary in their color intensity for no apparent reason -- some being a dark purple-pink, while others are light pink. They do have a distinct fragrance. Speaking of rabbits multiplying, they also easily seed themselves in my habitat.
Sundown, part of the Big Sky series, is what happens when breeders get involved. This coneflower puts out a riot of blooms early, then dies out before summer ends. The blooms start out with an beautiful orange color then fade in a few days into an dirty washed-out salmon. Deadheading does not seem to help the plant continue into the summer, as foliage turns a dark bronze like it has given up making chlorophyll. The plant goes ugly on me and slowly melts away until next year. The internet is full of stories of disappointments on this one.
Coconut Lime, another plant breeder introduction, looks different than the others. The blooms start out with petals and centers looking like the native, but the centers begin to increase into larger pompoms. The blooms last a long time, but bees never touch them. I suspect the thick pompoms prevent them from getting to the pollen, or the pollen is not to their liking. Height is much shorter than the other two coneflowers at about 16-inches (40 cm.)
For The Record:
Small amount of fertilizer on the Sundown
Some early season pests eat bloom petals & leaves
Blooming: coneflowers, liatris, rudbeckia, daisy, monarda,
echinops, phlox, daylilies, bachelor button, zinnia, hydrangea
Harvested: 20 onions, green beans