What is too hot?

This will depend on the plants –

  • Cool season plants like pansies, snapdragons, and veggies like broccoli, lettuce, etc. don’t like temps above 75.
  • You will see those veggies bolt, (Go to flower and seed).
  • Warm season plants like tomatoes, peppers, squashes, zinnia, impatiens, & annual vinca love & thrive in warm temps (75-90).
  • But when we get in the mid and upper 90’s to 100 even those can slow production or suffer.
  • Newly planted perennials, trees & shrubs too can suffer.
  • The more mature a plant is the better it should be able to withstand the heat.

It’s hot outside – Should I water more?

  • Not necessarily. Plants may look wilted just as a reaction to the afternoon heat, they may bounce back in the cooler evenings.
  • If that happens, they don’t need water, if they are still wilted in the AM, they need water.
  • If you just water without knowing how much moisture is in the soil, you may overwater them.
  • Plants can temporarily shut down all their functions when we get to the high 90’s.

Solution: Get a water meter! AND Water deeply, not just during the heat spell, but all the time. 

  • Train the roots to go deeper for water.
  • The deeper the roots go to get water the better off they are when the heat or stress comes.
  • The top few inches of soil dries out much quicker than the deeper soil.
  • This is true of all plant categories – annuals, perennials, shrubs, trees & veggies!

Remember plants are pretty resilient.

  • Just like people – keep your plants as healthy as possible!
  • When they are healthy, they will be more resilient when stressed by the heat of other environmental elements.

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Source: customer-service@bestyard.com in collaboration with Associated Landscape Contractors of Colorado