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Fertilizer? #866357

Asked April 29, 2024, 4:27 PM EDT

have been gardening at my location for 22 years. Many years I’ve used compost as mulch. From the U of M and also another reliable source. A few years I used milorganite. I had my soil tested with you last year. I have not used synthetic fertilizers. A fellow gardener down the street uses synthetic 10 – 10–10 and her plants look extraordinarily happy!! Your soil analysis showed I should use 20 – 0–15. This is interesting because my hydrangeas and peonies have little to zero blooms. The blooms they do get are small and insignificant- the leaves on one large hydrangea and also my large cimicifuga are light in color and light veining. My catmint has disappeared. I am not able to grow Russian sage. My winter Hardy Rose should be 6 feet tall and it’s barely a foot tall with little to no blossoms. Your soil test revealed high in organic matter which I would think would result in healthy plants. I look forward to your response. Feel free to call or email me, Lori Tate<personal data hidden>.

Hennepin County Minnesota

Expert Response

Could you confirm the hours of sun the plants you mention get? In addition, what type of moisture do they receive? Lastly, are there any large trees or shrubs near them? This information will assist in answering your question. 
Amy J. Extension Master Gardener - HC Replied April 29, 2024, 10:27 PM EDT
Hello- 6 -7 hrs sun. Plenty of moisture- I water. No trees near or blocking sun .
Thank you,
Lori Tate
Sent from my iPhone

On Apr 29, 2024, at 9:27 PM, Ask Extension <<personal data hidden>> wrote:


The Question Asker Replied April 30, 2024, 10:08 AM EDT

Thanks for your question.  It seems as if you are wondering why your various plants are not performing as well as those of your neighbor.  There are all sorts of reasons for this.  In order to help you further, could you please send me a picture of the soil report that you received last year?

Many thanks.

An Ask Extension Expert Replied May 02, 2024, 1:18 AM EDT
Thank you!!!image0.png
Sent from my iPhone

On May 2, 2024, at 12:18 AM, Ask Extension <<personal data hidden>> wrote:


The Question Asker Replied May 02, 2024, 11:12 AM EDT

Thanks for using our forum.  I had trouble in opening your soil report.  Hence my delay.  I have now solved that problem so should get an answer back to you shortly.

An Ask Extension Expert Replied May 09, 2024, 1:18 PM EDT

Thank you for your soil report.

Your soil texture is coarse which implies that it is rather sandy. The high organic content (17.3%) is partly responsible for the elevated phosphorus level in the soil. For 2024, I would suggest that no compost be added. I believe that the existing compost in your garden should be given time for further decomposition. Sometimes too much organic content is not a good thing. As it turns out and depending upon the nature of the compost, some type of chemical fertilizer is often added to the soil having a high organic content. More specifically, I suspect that some form of nitrogen needs to be added. A nitrogen deficiency might have led to the disappointing gardening results that you observed.

It may be hard to find a 15-0-20 fertilizer as was recommended in the report. Rather I would suggest using a 10-10-10 fertilizer. If you apply 1 pound of this fertilizer to 100 square feet of garden, you will then be adding 0.1 pound of nitrogen, 0.1 pound of phosphate, and 0.1 pound of potassium. I would suggest that you do this now (early May 2024) and then repeat this same application in late June. By following this schedule and with frequent watering, I think that you will see an improvement in your garden.

Good luck. Get back to us with any other questions you might have.

An Ask Extension Expert Replied May 09, 2024, 11:58 PM EDT

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