I have cosmos plant that grew like trees & never had blossoms, why?

Carol S
by Carol S
I have no clue - are their male & female plants?
  2 answers
  • Luis Luis on Aug 24, 2014
    Carol, did you start them late? Cosmos needs short daysto bloom. If you started them late, the days have become long, so it willactually take them longer to bloom. They will more likely bloom when the daysare starting to get short again. Cosmos are sensitive to day length. If yousearch the internet "cosmos day length" you will find a lot ofinformation related to this phenomenon.
  • Douglas Hunt Douglas Hunt on Aug 25, 2014
    Another factor may be fertilizer. If you have used a nitrogen-rich fertilizer, it will encourage foliage growth at the expense of bloom.