Many native species sleep in the soil
During spring and summer, sweat bees such
as these can be seen foraging on many
blooming plants. (Photos: Kathy Morrison)
Mulch is a wonderful thing, and we have lots of free mulch falling from our trees now. But please don't cover every inch of the garden with it. The native bees we've worked so hard to entice to our plants need some bare soil.
Many California species -- and there are about 1,600 native bee species -- nest underground. Honeybees, which are not native, live in hives, of course. Native carpenter bees do what they're named for: carve holes in fence posts and other wood for their nests.
But other bees are solitary. Smaller than honeybees, sometimes tiny, they nest in soil holes barely the width of a pencil lead, usually in flat, sunny spots. Some bee species nest in already-existing cavities or holes.
I was able to see ground-nesting bees up close earlier in the year when I was adding new chip mulch around my rose bushes. Suddenly 5 or 6 little bees appeared, hovering in a rather agitated manner. I scraped back the chips they were flying over and, sure enough, there were little holes in the ground near the base of one bush. I found other tiny holes at the edge of the same planting area, near the driveway. I watched one bee crawl into its hole.
Now I'm more cautious about what I cover up, and am careful to leave some areas uncovered in each planting bed. (Note: Mulch shouldn't come right up against stems or trunks anyway, since that can promote rot.)
Now, leaf mulch or leaf litter does offer protection for bumble bee queens, and butterfly and moth species, as well as that gardener favorite, the lady beetle. So do leave some leaves!
Pollinators may go into hibernation when the weather turns colder, but they don't go away entirely. And we want them back in spring.
(For more on pollinators and winter, check out this excellent post from the Xerces Society.)
A postscript on an oak tree
This is the remaining stump from the blue oak that
lost its leader branch in late October.
Sure enough, it's been cut down to the final few feet of its 4-foot-wide trunk. I peeked at the stump and wasn't surprised to see the center rotted out. We're probably lucky that the branch fell when it did, rather than the entire tree falling down and taking out a lot of the nearby trees and the utility building next to it -- and potentially harming park visitors.
But I will miss this tree.
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Dig In: Garden Checklist
For week of Feb. 18:
It's wet to start the week. When you do get outside, between or after storms, concentrate on damage control:
* Keep storm drains and gutters clear of debris.
* Clean up tree debris knocked down by wind and rain.
* Where did the water flow in your garden? Make notes where revisions are necessary.
* Are any trees leaning? See disturbances in the ground or lawn around their base? Time to call an arborist before the tree topples.
* Dump excess water out of pots.
* Indoors, start peppers, tomatoes and eggplant from seed.
* Lettuce and other greens also can be started indoors from seed.
* Got bare-root plants? Put their roots in a bucket of water until outdoor soil dries out. Or pot them up in 1- or 5-gallon containers. In April, transplant the plant, rootball and all, into the garden.
* Browse garden websites and catalogs. It’s not too late to order for spring and summer.
* Show your indoor plants some love. Dust leaves and mist to refresh.
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