The Q&A Archives: Cosmos Topple Over

Question: I love my cosmos but every year they grow so tall that they end up toppling over and making and untidy mess--although they bloom beautifully. What is the reason for this? Why do some bloom when they are 14" high and others grow and grow and grow before they will bloom?

Answer: These plants need full sun all day long and grow best on a lean soil--meaning not an overly rich soil. Hold back on fertilizer--some compost added at planting time may provide enough nutrients for the season. There are cosmos varieties that remain relatively short; you may want to try these instead of the ones that grow 4-plus feet tall. Check variety descriptions carefully.

« Click to go to the homepage

» Ask a question of your own

Q&A Library Searching Tips

  • When singular and plural spellings differ, as in peony and peonies, try both.
  • Search terms are not case sensitive.

Today's site banner is by ge1836 and is called "Sempervivum Henry Carrevon"