The Q&A Archives: Cold damage to Red Salvia

Question: Guess this is a biology/botany question. I planted my Red Salvia too early and they all suffered cold damage. Strange thing is just the top half of plants were damaged--bottom leaves look healthy. I cut the bad/top part off hoping they'll recover. My question's why would just the top half of plant be damaged when the entire plant was exposed to the cold? Just curious. Thanks!

Answer: The topmost leaves are the newest ones and therefore most susceptible to frost damage because they are not old enough to withstand the cold. And, the ground actually radiates some heat, even when the air temperatures are cold so the lower parts of the plant, along with the roots, are somewhat protected from a light freeze. Glad you asked!

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