Raising Butterflies Blog
Prepare Milkweed Plants for Monarch Eggs- Raise The Migration

Welcome back to Raise the Migration, where hopeful monarch enthusiasts come together together to boost the struggling monarch population. Letโs raise and release butterflies to keep the magical monarch migration alive for future generations in Canada, the United States, and Mexicoโฆevery monarch counts in 2023!
Your Eggs-citing Monarch Adventure is about to to Beginโฆ

If you havenโt seen the raising supply list, please refer to it now to insure you have everything you need to get started. If you canโt access the supplies you need, just follow along and make adjustments or use these raising tips for future monarch generations.
In case you forgot, my name is Tony Gomez and Iโll be guiding you through this 30 day transformation. This page wasย postedย on July 8, 2023. Remember that you donโt need to follow along in real timeโฆ
Iโm starting earlier than I normally would so youโll never have to wait or proceed into unchartered waters.ย Allย in monarch territory from northern Canada to the southern US still have plenty of time to raise monarch butterflies for the great fall migration.
Check out the info on the supply list about the best time to start raising for your region.
PREPARE MILKWEED FOR MONARCHS

Before you can expect to receive prized monarch eggs, itโs important to prepare milkweed plants in advance for your honored guestsโ arrival.
Milkweed is the only host plant that can be used for growing monarchs through the butterfly life cycle. Luckily, you have multiple species of milkweed to choose from.
If youโre afraid you donโt have enough milkweed to support monarchs (and donโt have access to a pesticide-free local milkweed source) consider starting a butterfly garden first.
If youโve got enough milkweed to support the monarchy, letโs talk strategyโฆ
Potted Milkweed Plants
For the past few seasons, we have placed tropical and swamp milkweed containers on our raised beds, in garden carts, and other various places in hopes of attracting gravid (mated) monarch femalesโฆit works!
In fact, it worked a little too well a few years back when we got 53 eggs on just two potted milkweed plantsโฆin one weekend!
We stopped raising monarchs on potted plants because of hidden predators and declining plant health indoorsโฆbut milkweed container plants are still a fantastic tool for attracting monarch mamas:


- Start preparing a few milkweed plants 1-2 weeks before you want monarch eggs
- Water thoroughly every few days at the base of your plant(s) to keep leaves hydrated. Water more or less depending on your August precipitation and late-summer drought conditions
- Swamp Milkweed and Tropical Milkweed are two of your best options because they grow well in pots and are easy to transplant. They are also favorite egg-laying milkweeds for late season monarchs.
- Any milkweed you prepare should have fresh, healthy leaves. Remove sickly leaves or stems from milkweed plants and discard.
- Cut off blooming flowers on a few plants you want to collect eggs from. The absence of flowers will reduce (but not eliminate) visits from monarch-seeking predatorsโฆflower buds are ok because they provide cover, and are a preferred spot for egg laying.
- Check plants for predators ๐ท and foreign eggs. These should be monarch-only milkweed plants for egg collection purposes.
- Don't use insecticides or harmful household chemicals around milkweed plants
- Having issues with aphids? Here are 10 Ways to Win the Milkweed War against Aphids
Whyย Not FULL Sun?
Partial shade will keep leaves fresh longer, and prevent eggs/cats from getting cooked by the unrelenting summer sun.
Why Away from the Main Patch?
There tends to be a higher concentration of monarch-munching predators inside a milkweed patch. Lone milkweed plants usually get less attention from pesky predators.
Keep an eye on your plants while youโre waiting for monarch eggs. If you find ants, stink bugs, spiders, tussock moth caterpillars, or foreign eggs remove and relocate them. These should remain monarch-only milkweed plants while waiting.
note: You do not need to pot milkweed, but I often find eggs on ours and have heard similar reports from others. If you have lone first-year milkweed plants that have seeded in your garden, those are also prime real estate for collecting treasured eggs.
POTENTIAL PROBLEMS WITH RAISING ON POTTED MILKWEED
- Predators and pests can be hiding in the plant or on the container
- Heavy containers can accidentally wound or kill monarchs
- Soil can become moldy, collect frass (poop), or have disease spores/pathogens
- Difficult to effectively clean/rinse an entire plant
- Plants put out/maintain healthier growth outdoors
POTENTIAL SOLUTIONS TO POTTED MILKWEED PROBLEMS
- Leave potted milkweed outside
- Collect stem cuttings with eggs off potted milkweed to bring inside
- Collect individual leaves with eggs off potted milkweed to bring in
- If raising on container plants, check for predators multiple times
Milkweed Cuttings
Leaf and stem cuttings are, in my opinion, the best way to raise healthy monarchs because the milkweed stays freshย and cuttings keep monarch larvae from crawling around in potentially disease-ridden frass. (poop)
You can also space out cuttings across your entire cage, which you canโt do using whole plants.
Since these will come from your garden plants (or another nearby patch) make sure your milkweed looks healthy and isnโt being overrun by predators or pests. Otherwise, youโre unlikely to collect a monarch deposit.
A good way to insure you have โcleanโ milkweed for future seasons, is to diversify your milkweed species and plant several patches around your yard and garden. Predators and pests wonโt be able to find them all!
Milkweed Cuttings can range in size from 1 leaf to 2 foot stalks, and what you use will depend on the height of your cage and cutting containers.
During spring and early summer, I use Asclepias syriaca (common milkweed) cuttings. I also use first-year common plants and the fresh regrowth from past cuttings later in the season.
In late summer, I switch to Asclepias incarnata (swamp milkweed), Asclepias curassavica (tropical milkweed), Gomphocarpus physocarpus (balloon plant), & Gomphocarpus fruticosus (swan plant), and Calotropis gigantea (giant milkweed) buds and leaves.
What you use will depend on whatโs available in your region to host late-season monarchsโฆ
Note: I realize many of these options arenโt native plants, but most native milkweed looks pretty scraggly by seasonโs end. Tropical milkweed and balloon plant are our last milkweed plants with viable leaves for the caterpillars and the late summer favorites for egg laying.
As long as the milkweed is healthy, any garden variety milkweed can be used to feed and grow your caterpillars.
WHAT IF THE ELFS (EGG LAYING FEMALES) DONโT COOPERATE?
Unfortunately, the decline in the monarch population means monarchs are no longer a sure thing in North American butterfly gardens. I still believe that if you put the time into improving your butterfly garden, they will eventually comeโฆbut that doesnโt mean a predator wonโt find the eggs or baby caterpillars before you do.
BUYING EGGS AND CATERPILLARS
For those of you who want to insure youโll be raising migration monarchs, there are a few options for buying them. Monarch egg/caterpillar vendors are on the supply list.
And now comes the hard part: waiting for your monarch eggs to arrive by airโฆor airmail!
I hope this info helps you to Prepare Milkweed for Monarchs. For further assistance raising healthy monarchs through the butterfly life cycle, a โฌโฌโฌโฌโฌ ratedย bookย on How To Raise More Monarchs, with Less Effort is available for purchase HEREย <<<ย (choose paperback or PDF download)