What Temperature Can Cosmos Tolerate?
What Temperature Can Cosmos Tolerate? Cosmos is a heat-loving plant and does best above 60°F(16°C). Below 55°F(13°C), growth and flowering are inhibited. Are cosmos cold hardy? Seedlings tolerate light frosts, but plants are killed by freezing temperatures. What temperature will kill cosmos? Cosmos grow very quickly but can be killed by a late frost, so