Plant Health in Minnesota – Frequently Asked Questions

What is the difference between tree fertilizer spikes and professional fertilizing service?

With the DIY fertilizer spikes, if you pound 6 spikes into the ground around the tree at a rate of 0.50 lbs nitrogen per 1,000 sq. ft., all the nitrogen is concentrated within those 6 sites.

When Proturf deep-root injects fertilizer under the drip line of tree, we inject a slow-release fertilizer that is suspended in water into the ground about 15″ deep. We do this in a grid pattern throughout the entire drip line of the canopy, approximately 60 different locations, at a rate of 3-4 lbs nitrogen per 1,000 sq. ft.

Do I need to treat my Ash for Emerald Ash Borer (EAB)?

The EAB was found in the heart of the Twin Cities in 2009. The MN Dept of Agriculture is suggesting that if you live within 15 miles of Minneapolis or St. Paul that you should consider treating your tree if you want to protect it. Treatments are very effective if they are administered to healthy trees before they have any EAB damage. You should decide if the tree is of high value and you want to keep it long term. Ash trees should be treated annually once you begin treatment.