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Autumn Blaze Maple #941857

Asked August 08, 2026, 9:24 AM EDT

Hi. I have a three year old autumn blaze maple, and a more mature five year old as well. I am curious if these guys need any type of fertilizer, and if so, what might you recommend? They are planted in full sun, I do water them slowly, and (for soil reference) they are planted in watered grass in Mapleton Hill in Boulder. Thanks!!

Boulder County Colorado

Expert Response

Good morning, 

Thank you for your question. Shade trees generally do not need and additional fertilizer unless they are showing signs of nutrient deficiency. This page has some great information:
 https://extension.colostate.edu/resource/fertilizing-shade-trees/

Please let us know if you have any additional question!

Kindly,
Boulder County Master Gardeners
An Ask Extension Expert Replied August 10, 2026, 11:42 AM EDT

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