Cut Back Plants
In my article Fall Chores in the Pollinator Garden I go into detail (with lots of photos) discussing why we don't cut everything back when plants have died back at the end of the year. In short, it's so that we leave seed for birds as well as overwintering shelter for invertebrates and other wildlife. Plant stems and grasses also provide important structure in the garden through the winter as well as visual appeal.The biggest chore in the late winter and early spring (late February-March) in the pollinator garden is to cut all the herbaceous plants back that you let overwinter from the previous year.
About 25% of our native bee species in North Carolina nest in cavities like plant stems. Most of these bees nest in hollow stems but a few species like carpenter bees, some leafcutter bees, and small resin bees can nest in stems with a soft pithy center.
Wen you cut plants back in early spring, cut them back to a height of 8-24 inches. This will open them up to the many species of stem-nesting bees that will be emerging in the spring looking for nesting sites: mason bees, leafcutting bees, resin bees, yellow-faced bees, and small carpenter bees.
My article Provide Nesting Habitat for Native Bees through Plant Stems in Your Garden provides lots of details and photos on managing stems in the garden for stem-nesting bees.
Weed
Weeding rivals cutting plants back as far as importance in the spring. There comes a certain point in the spring when all of a sudden it feels like the weeds are going to take over the garden beds and it seemingly happens overnight! Common spring weeds include chickweed (Stelleria media), creeping charlie (Glechoma hederacea), purple deadnettle (Lamium purpureum), dandelion (Taraxacum officinale), wild onion (Allium canadense), hairy bittercress (Cardamine hirsuta), mugwort (Artemisia vulgaris), and more. Some of these benefit pollinators and would be fine to leave in a lawn but I remove them from the pollinator garden where they multiply and outcompete the native perennials.When the weeds get out of control I practice what I call "rescue weeding" where I concentrate first on weeding around the perennials that have been overtaken by weeds to the point that you can barely see them. Once I have "rescued" those plants I can concentrate on weeding in more open areas where the weeds are not directly impacting neighboring plants.
Divide / Remove Aggressive Spreaders
Another important task in the spring is to spend time removing some of the aggressive plants that spread throughout the garden and overrun other less competitive species. This is typically done in the spring and the fall. Aggressive species include cup plant (Silphium perfoliatum), spotted horsemint (Monarda punctata), golden alexander (Zizia aurea), poppy mallow (Callirhoe spp.), lyreleaf sage (Salvia lyrata), Arkansas bluestar (Amsonia hubrichtii), green-head coneflower (Rudbeckia laciniata), blazing star (Liatris spicata), ironweed (Vernonia spp.), splitbeard bluestem (Andropogon ternarius), asters (Symphyotrichum spp.), spiderwort (Tradescantia spp.), oxeye daisy (Helianthus helianthoides), orange coneflower (Rudbeckia fulgida), and others. If allowed to go unchecked, the biodiversity of the garden would severely decline as the less competitive species disappeared.
Plant
We do the bulk of our planting in the fall (October-December) which is optimal for perennials and shrubs but we usually do a little replacement planting in the spring. This might be for the occasional plant death or gap that has opened up or for a marginally hardy Mediterranean herb that can't be fall-planted.
Prune
Early spring is a good time to prune woody vines like native climbing aster (Ampelaster carolinianus). This is a very vigorous woody vine that is typically grown on a trellis. We cut it back hard, about by half, in mid-March, and then prune it back by about one-third another two times in the spring every few weeks as it grows out. We also maintain a couple of climbing asters as free-standing shrubs in the garden and prune them the same way in the spring.
We do minimal shrub pruning in the pollinator garden since the shrubs are all native species and not maintained as hedges. Occasionally when a shrub becomes too large or misshapen I might cut it down to within 3-6 inches from the ground to give it a fresh start in what is called rejuvenation pruning. Not all shrubs can tolerate such severe pruning so make sure and do your research. Rejuvenation pruning can be done in stages (e.g., cutting back a portion of the stems each year) or all at once. It should only be done on plants that are well established.
In the pollinator garden I have used rejuvenation pruning on American beautyberry (Callicarpa americana) and buttonbush (Cephalanthus occidentalis) and they responded very well (see photos below). I do it right before growth begins in the spring. Because rejuvenation pruning stimulates growth I follow up the next year and thin out some of the new growth to prevent stem overcrowding.
Deadhead
Deadheading is the removal of spent blooms. We only deadhead a few species of plants in the pollinator garden because for most species we want them to go to seed to provide food for wildlife. However, some species like blanketflower (Gaillardia spp.), purple coneflower (Echinacea purpurea), bee balm (Monarda spp.), culver's root (Veronicastrum virginicum), garden phlox (Phlox paniculata), and others rebloom after deadheading so their bloom time can be extended if you want to spend the time deadheading.We also deadhead certain species like golden alexander (Zizia aurea) to minimize seed dispersal as a way of managing their spread throughout the garden.
Mulch
We mulch our beds once a year in early spring with about 3-4 inches of triple-shredded hardwood mulch. This annual application of mulch has greatly improved the soil tilth and organic matter content. We try to leave areas in most beds that are mulch-free for ground-nesting bees and have also created ground-nesting bee habitat on site.
Remove Invasive Chinese Praying Mantid Egg Cases
Folks of all ages delight in finding praying mantids in the garden. These charismatic predators are large and easy to spot and have a reputation for being cool beneficial insects, helping to dispatch garden pests.But what if I told you I have an annual early spring ritual where I devote time to purposely removing and destroying praying mantid egg cases from my pollinator garden?
Why would I want to remove praying mantid egg cases? Because unfortunately the most common praying mantid in most North Carolina landscapes is the invasive non-native Chinese mantid (Tenodera sinensis), and they can be a menace in the garden. They produce the egg cases that I seek out and destroy.
Resources for Further Learning
Snapshots from the Pollinator Garden
Challenging the Conventional Wisdom about Praying Mantids
Provide Nesting Habitat for Native Bees through Plant Stems in Your Garden
Fall Chores in the Pollinator Garden
Pollinator Paradise Demonstration Garden
Pruning Trees & Shrubs: General Pruning Techniques - NC State University
Pruning Trees & Shrubs: How to Prune Specific Plants - NC State University
