There were concentrated and evaluated 21 varieties of Rudbeckia hirta L., 12 varieties of Cosmos bipinnatus Cav. and 9 varieties of Cosmos sulphureus
Cav. for the establishment of flower mixtures by direct sowing in the
garden and landscape design. Very poor emergence rate of all varieties
of Rudbeckia hirta L. in all repetitions confirmed the impossibility of their cultivation by direct sowing. All evaluated varieties of Cosmos bipinnatus
Cav. demonstrated the possibility of direct sowing cultivation, but
high varieties can not be recommended for direct sowing on beds due to
uneven height, late beginning of flowering and susceptibility to
lodging. All evaluated varieties of Cosmos sulphureus Cav. were
characterized by good seed emergence rate, balanced and reliable
flowering, solid and orderly growth, even in the case of higher
varieties. All evaluated varieties can be recommended for cultivation.
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