When do I use 13-13-13 on my plants?

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Some of my plants do not bloom anymore. I was told to use 13-13-13. What time of the year do I use it?

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  • Danielle Odin Danielle Odin on Feb 04, 2018
    This is the chemical compound of the fertilizer. Not all plants take the same type. Evergreen are different from flowering. Some plants require more acidic soil. It all depends on the plant. Google the name of the plant and it will give you the care and feed of said plant.
  • S.h. S.h. on Feb 04, 2018
    Use a fertilizer made for blooming plants that has the second number higher than the first. The first number is nitrogen which will produce plant growth, not flowering. Also, some flowering plants need more light to bloom and at the proper time of the year. See a plant care guide for your particular plants.
  • Linda Sikut Linda Sikut on Feb 04, 2018
    It looks like you need more phosphorus (the second number in your mix). Learn more about the numbers in your mix by clicking on the link below. Wishing you the best.
  • John John on Feb 04, 2018
    Fertilizer is not a cure-all. Can't tell if you are speaking about indoor or outdoor plants. If indoor, the amount of light they get also controls flowering. If you are referring to a houseplant, when you first buy them they had been in a greenhouse of some kind. The flowering was initiated then, and when you bought it the blossoms were starting before you even bought it. Then as it adapts to the new environment with less light, it puts its attention, and growth to things such as roots and leaves (the vegetative parts) instead of reproductive growth (the flowers).
    Depending on the number of years you have had them and the amount of soluable salt build up (this is caused by water and fertilizer) in the soil, this can also control flowering.
    On annual flowers, keep dead blossoms off. Plants such as geraniums should have the dead heads removed to avoid disease and stimulate new blossoms.
    That said, if outdoor plants are involved, fertilizing in spring, then early summer and again in late summer should help. If the plants are shrubs, keep in mind that regular pruning will generally stimulate new growth which has a better chance of flowering. Pruning should be done right after the flowering season. If you do not do it then, you run the risk of pruning the flower buds off that would have blossomed the following year.

    John Virdo
    Resident Horticulturalist
    Gervasi Vineyard, Bistro, & Villas
    Canton, Ohio
    jvirdo@gervasivineyard.com
    • Velma Velma on Feb 04, 2018
      Thank you, I should have wrote a little more. I was referring to my Crape Myrtles I have 3 planted in a row about 6 feet apart. One has lots of blooms. The next one just had a couple of blooms the last one doesn't bloom at all. These have been cut down every year. Some one told me they need 13-13-13. It didn't help. Just thought I would throw my question out there.
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