Can I use redwood leaves as mulch under established blueberry bushes?

Asked November 9, 2019, 12:04 AM EST

Can I use redwood leaves as mulch under established blueberry bushes?

Marin County California

3 Responses

Thank you for your question. When you say redwood ‘leaves,’ are you referring to limbs and needles, or bark? Thanks!

Redwoods don't have needles per se. They have a green, leaf-like something. These fall off the tree (although redwoods are not deciduous) during the dry fall season and make a thick carpet under the tree. This year, I raked up heaping piles of them and spread them around the yard. Now I'm worried that they have some sort of natural weed killer in them that will kill the plants around them.

Thank you for clarifying. Horticulturists call them ‘needles,’ although they differ from other conifers. (http://marinmg.ucanr.edu/Marin_Master_Gardener_Help_Desk/Leaflet/Redwood_trees_are_horticultural_marvels/) But, apropos of your question, the redwood tree’s plant structures are not, in and of themselves, harmful to other plants (alleleopathic) such as are walnut trees (Juglans sp.) If they have been treated with a chemical herbicide, that chemical may be harmful. Here is an Extension article about where the needles can be used as mulch: https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=14317 Hope this is helpful.