Tag Archives: monarch

Help monarch butterflies by giving away milkweed plants

Like most monarch fans, I dutifully pack my yard with milkweed and hope the offering will somehow offset the effects of habitat loss and pesticide applications on population levels. But I’m not a complete idiot so I know that my contribution is probably rather inconsequential. Planting milkweeds for a few dozen monarchs is not really going to help population declines.

So this year I finally got around to something I’ve been meaning to do for years: give away lots of milkweed plants. My goal was to distribute free seedlings to several hundred people in my town (Swarthmore, Pennsylvania), ideally creating a concentration of milkweed that might make a difference. And because milkweeds are perennials and produce seeds that disperse with the wind, all of those initial milkweeds would do their reproductive duties for years, seeding vacant lots and such. Perhaps after a few years we will start seeing flocks of monarchs again (I’m an optimist).

This post summarizes how I grew the plants and gave them away, just in case anyone else might be nudged to do something similar. If one person in every town did this we might reverse the yearly declines in monarch populations.

Step one was to collect seeds. If you’ve never done it before it’s easy — just pick browning pods and let fully dry. Here’s a photograph from 2018 showing some swamp milkweed pods:

You don’t need to, but I decided to clean my seeds. Here’s the end product:

Milkweed seeds germinate best if they are exposed to a period of cold, ideally when moist. So all I did was scatter the seeds on a few large containers (actually, unused litterboxes). Come spring I had hundreds of seedlings emerge.

As seedlings emerged I’d transfer them to small Dixie cups. I soon covered almost every square inch of sunny space in my yard. (That’s my bee hotel, by the way.)

Then I started giving them away to people in town who had expressed an interest in growing milkweed. I put the seedlings into cheap paper cups and then delivered sets of threes to doorsteps. This used up about two dozen seedlings.

To get people to plant milkweed I thought it might be fun to leave pots around town along with, “please adopt us” notes. I gave away probably 100 this way. Usually the pots would be taken within an hour or so. It was fun leaving them in obscure spots around town, and I was hoping to build some curiosity about who was doing this and why.

Here’s the note I left with each set. I went with “rose milkweed” because I worried that “swamp milkweed” might be a turn-off for some. But same plant: Asclepias incarnata, my favorite milkweed. And it’s native.

Here are seedlings bound for one of the giveaway events. There were even more pots in the front.

Here’s my display table. I held the events on days when large crowds would be expected, so probably 95% of takers were people who didn’t realize they even wanted milkweed plants.

In total, I probably gave away 500 milkweed plants this year. I’m not positive it was a success but I think I noticed more monarchs around town this year. As anecdotal evidence, I wasn’t even trying to photograph a monarch when taking this picture:

If you have milkweed plants and seed pods, give it a try in 2020. It would be especially good if garden clubs across the country made this a priority.

Identifying mantid egg cases in Pennsylvania

Below are photographs and descriptions of egg cases of the (native) Carolina mantis, the European (=praying) mantis, the Chinese mantis, and the narrow-winged mantis.

Carolina mantid (Stagmomantis carolina)

Carolina mantids (the only native species in my area) form relatively smooth, teardrop-shaped oothecae with a central portion that is lightly colored. Often found on tree trunks, rocks, and buildings.

Egg case of Carolina mantid (Stagmomantis carolina)

European mantis (Mantis religiosa)

These oothecae are somewhat similar to the Carolina mantis’ but lack the alternating bands of color. Another common name for the European mantis is the praying mantis.

Egg case of European mantis (Mantis religiosa)

Chinese mantid (Tenodera sinensis)

Chinese mantid oothecae are typically roundish, roughly textured, and uniform in color. Introduced from Asia, as you probably guessed.

Egg case of Chinese mantid (Tenodera sinensis)

Narrow-winged mantid (Tenodera angustipennis)

Narrow-winged mantid oothecae are usually rather elongate. They are also seem to have red streaks, though the color seems to be most noticeable after they age a few months. Introduced from Asia, too.

Egg case of narrow-winged mantid (Tenodera angustipennis)

More ID help

For an excellent overview of all of these species, please see the Cape May Wildlife Guide’s page on mantids. Please also see the excellent guide by Paweł Pieluszyński of the Brooklyn Bridge Park, especially because it includes an ootheca of the Asian jumping mantis (Statilia maculata) that is probably lurking undiscovered in Pennsylvania. If you need help identifying an ootheca, I highly recommend posting a photograph on iNaturalist. Not only will you get an answer from the iNaturalist community within a day or two, your submission helps scientists track the spread of invasive species.

What should you do with the non-native oothecae?

Invasive mantids eat butterflies, native bees, honey bees, small birds, and also the native mantid, so when you find egg cases, dispose of them. Here are some suggestions on how to do that:

  • Put them in a freezer for a week
  • Step on them
  • Give them to a neighbor who has chickens
  • Give them to local bird rehabilitation centers
  • Give them to a neighbor who has a pet tarantula, snake, lizard, or fish

Whatever you do, please not just relocate oothecae to some nearby field — that just transfers the problem to someplace where you can’t see the problem.

But aren’t mantids great for pest control?

Although it’s true that young mantids consume a lot of insects, some of which might be pests, when mantids are fully grown they tend to camp out on flowers and wait for large butterflies and even small birds. Mantids are, of course, excellent for controlling butterflies and hummingbirds in case you happen to hate those animals.

Monarch butterfly captured by a Chinese mantid (Tenodera sinensi
Monarch butterfly captured by a Chinese mantid (Tenodera sinensis).