Coffee does supply some fertilizer ingredients:

Nitrogen: 2.28 percent
Phosphorus: 0.06 percent
Potassium: 0.6 percent
Trace amounts of Cu & Mg
pH of new grounds 3 to 5 - pH of used grounds is 6.9 - 7

NOTE: These nutrients are for new coffee grounds, used grounds will have
almost all of the above nutrients washed out, leaving almost nothing.

Millet

I mix it with the soil,if you put it on top,it get a greenish color,and after a few day,s off sun it get rock hard.

I don't ever use coffee at all, but I would add to the conversation that if coffee is used as a mulch and applied to thick it can also turn into a sludge. But when mixed with other organic material it works OK. (167 BO-)_

So are the alkaloids from coffee taken up by plant root systems to provide protection to the leaves or are grounds in the soil just protecting the soil/roots and protecting from insects that need to utilize the soil? Laaz, are you only using grounds in/on the soil or are you also spraying the leaves with dilute coffee?
My citrus got some coffee ground top dressing this morning.

I only put them on the surface of the soil & water them in. I also pour the remaining coffee I don't drink in as well.

can I raise the PH using some lime to wash the coffen ground before using it?

Millet , you said that you never used cofee , but have have you at least tried to see how it is?

on citrus tree and especially in coffee tree it might work ok

thank you all

Laaz are the coffee grinds still working?. I added a few citrus and the leaf miners are having a field day.

I think so, but I am using a combination.

I have some friends in coffee business and they gave me some coffee grounds from their expresso machines(plain with no sugar in it) and I used it on some Blueberries and some Hydrangea as it was , meaning that I've only dried it and then spreaded over the soil in the pot , it did the trick , soil PH was arround 4-5 and blueberries are doing fine. Great tip with cofee grounds!

I have been using coffee grounds for quite some time on roses and the seem to do very well.

It is widely thought that coffee grounds are acidic, but most of this acidity is removed in the brewing process. Used grounds are essentially neutral and composting them with other materials will buffer any minor residual acidity. Roasted coffee is fairly acidic, but almost all of the acid is water soluble and is extracted during brewing. Used grounds have essentially neutral pH, although the coffee beverage that a person drinks is rather acidic. The measured pH of used coffee grounds is 6.9, with a significant amount of buffering capacity. Therefore, when adding used coffee grounds to either acidic or basic solutions, the grounds will drive both towards a neutral pH. - Millet

I want to try this, but i am not sure how to do it. can i simply use the leftover on the bottom of the pot which i was boiling coffee in_
if i only put it in the soil, is it going to help eradicate leaf miners-




I am sorry about missing question mark. I can,t find it on this keyboard, when i press question mark button, i get dash

You can use any coffee grind you want.
I use these puck,s but when you make coffee the old fashion way by pooring hot water over the grind ,you use that,makes no difference.
In my opinion the ground will become more fluffy,not so dense.