The most common varieties are
hybrids of Cosmos bipinnatus, a half hardy annual with daisylike flowers
sometimes as large as four inches across, with the beautiful shades of pink and
red or white. Moreover, plants have airy, threadlike foliage and usually grow
about four feet tall, but sometimes taller (the sensation hybrids are shorter.
They’re ideal for the back of the annual garden. It is also use them to fill in
between clumps of tall perennials such as asters and phlox. Hybrids of C.
Further, sulphurous are shorter; normally around three feet and have yellow,
red or orange flowers that are normally around two inches across and sometimes
double as well. They are tender annuals. This is the preferred species for very
hot climates. If you have never tried this type of cosmos you are missing a
great flower. However, plants have airy but bushy foliage and bloom very
profusely.
Well, if you want to grow cosmos
flower, then you’ve to sow seeds outdoors after the last expected frost, or
indoors about six weeks before. Therefore, for optimum bloom plant in full sun
or part shade in soil that is not too rich or too moist. Plant at least 12
inches apart. Tall varieties often need staking, but can be pinched if you want
shorter plants and want more bloom. Source: Charismatic Planet
