Can I use the pine mulch from a stump?

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The acidic pine mulch should or should not be put around flowers. I did use it around pine trees but can I use it around Rodos .

  4 answers
  • Oliva Oliva on Mar 08, 2019

    Yes, Rhododendrens like acidic conditions.

  • 2dogal 2dogal on Mar 08, 2019

    Yes, most Rhododendrons can use pine mulch. They like acidic soil. If you use pine mulch, remember that mosquitoes like to breed in it.


    Get a soil test done so you know what nutrients, if any, are needed.

  • Lynn Sorrell Lynn Sorrell on Mar 08, 2019

    Are pine needles acidic? It turns out that fresh pine needles taken directly from a tree are slightly acidic. By the time pine needles gets old and are ready to drop off the tree they are barely acidic. After a few days on the ground, they lose their acidity completely. The brown pine needles, also called pine straw, are not acidic.

    There are two important points here. Since your source for pine needles is probably not green, they are NOT acidic. Collecting old pine needles is pointless if you are trying to acidify your soil.

    The second point is that even when fresh, pine needles are only slightly acidic and therefore can have limited effect on changing the pH of the soil.

    But, but , but, you say – surely over many years, the acidity must build up. This seems very reasonable and so some scientists tested this theory. They collected soil samples from underneath 50 year old pines. They also collected nearby soil samples where no pines had been growing during the same time period. They found that the pH of both soil samples were the same. The growing pines did NOT acidify the soil even after 50 years.

  • Lynn Sorrell Lynn Sorrell on Mar 08, 2019

    The reason Rhododendrons are said to grow good in forest type(pine tree) soils is because the forests where pines grow are limestone based(alkaline) and have decades of organic matter decomposing on top of that. The organic matter is what they love. It's best to add good old(over 1 year) compost or straight up fertilizer for Rhododendrons(if thery even need it). You can use the pine mulch it will retain moisture as any mulch would and will decompose providing organic mater which all plants love. If your Rhododendrons are fine you don't need to give them anything.