When do I need to start fertilizing my arborvitae with miracid this spring? Do I need to continue using the spray on miracid all summer like I have in the past or is there another fertilizer I can use? The spray on miracid works very well and my plants always look great as a result and have grown substantially over the last couple of years but it is a lot of work to fertilize regularly with the spray on miracid
Now that your arbs are established, it is time to stop the foliar feeding. When the ground thaws you can poke some holes in the ground maybe a foot deep and pour in a good, slow release food. I’d suggest Espoma Tree-Tone or Plant-tone for this. They are organic and safe. It will be tempting to use and evergreen food like Holly-Tone but, while arborvitae are evergreens, they don’t prefer acidic soil like most other evergreen so Holly-Tone isn’t the best choice. You could also feed them again in mid-September if you wish. Here a link to more on spring feeding