I used Miracle Grow cedar spikes on my white and black cedars in the spring. On the box, it recommends using the spikes at the end of autumn as well as in the spring. I always thought that cedars weren’t supposed to be fertilized after summer. Do you recommend using the spikes at the end of autumn as well as in the spring?
Thank you for reaching out to Toronto Master Gardeners.
Here is an article written by one of our team members on fertilizing cedars in the spring.
We would discourage you from applying fertilizer after mid-July, so that the trees have enough time to prepare for winter.
We wish you continued enjoyment of your cedars.