Caring for your Swan Plants (Milkweed)

Caring for your swan plants over winter months

Swan plants (Gomphocarpus fruticosus) originate from the Asclepiadiae family, which is a species of Milkweed.  Most Swan plants survive the winter if they have been cared for and nourished with water and re potted either to a larger pot or into the ground. Sometimes Swan plants struggle to grow back if completely chewed back by the hungry caterpillars. 

This also applies if you have an infestation of Aphids on your plants.  Aphids feed on plant juices, attacking leaves, and the new fresh growth.  You can tell if you have aphids, apart from the obvious and seeing heaps of yellow/orange bugs, (please see inserted photo below). Also by looking at the leaves by noticing honeydew (a sticky substance) which can sometimes develop a fungal growth called sooty mold, causing branches and leaves to appear black.  If your swan plant has been seriously attacked by many aphids it may not survive the winter as it would have become weak. Try cutting back the areas where the aphids once were, if you just have a few I would recommend squashing them with fingers and then spraying with a powerful hose with water, your fingers will turn orange but you will get instant satisfaction squashing them all. Be aware Aphids could easily appear the next day so keep a watchful eye out.  I plant heaps of nasturtiums as Aphids are especially attracted to this plants. You can plant these near your Swan plants as traps for the aphids. These seeds are really easy to grow – just put them straight into your soil and spread easily. I have heaps of these seeds that I give away to schools for their butterfly & vegetable gardens. I also plant heaps of Marigolds flowers of all different colours around some of my swan plants that are in pots as a barrier, the smell will repel aphids plus adds colour to your garden.

During peak summer months the aphids will appear in mass numbers, its just nature! Remember if your plants are well cared for with great mulch, food and water. Your plants may not attract the aphids and strong enough to fight them off, lady bugs are also great insects who eat the aphids but lady bugs would have their work cut out if you have many Aphids and may not tackle the problem entirely. Lady bugs also are known to eat the Monarchs eggs.

During winter months I would recommend gathering up your swan plants in pots and place them in your green house or a friends glasshouse if you haven’t got one.  If they are in the soil place a frost cloth around the plant and cover the roots/soil with pea straw to protect the roots from freezing.

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Once the Plants have been striped bare.

Does this look familiar? The photo below was only a few days worth of food for my brood of caterpillars. If you have Swan plants that are just stalks make sure you take care of them by frequent watering, plus feeding them with Yates Thrive natural seaweed tonic which reduces transplant shock in new plants, and aids recovery from stress conditions and improves plant resistance, eg: heat, frost, drought, pests and diseases.  I also add in some sheep pellets (which can be purchased from any garden centre) into the new pots.  Sheep pellets help stimulate green growth and enhance the leaves to grow back quicker. You can also snip back any stems that are not healthy looking and brown. These plants will soon be ready for another round of caterpillars for the same summer season.

If you have the time I strongly recommend replanting your plants into bigger pots, with good quality soil. One last thing – CHECK for eggs each day and, if you already have too many caterpillars, then remove or cull them if they are on the stems. Even in late March, Monarchs will still be laying eggs. This is no good as the weather is colder and you will have a hard job sourcing Swan Plants.  Again trim back brown stems – this aids regrowth.  For more information about caring for your Swan plants and raising monarchs you can purchase my  book on line below.  “An educational guide on Monarch Butterflies” Purchase my Book here 

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5 Comments on “Caring for your Swan Plants (Milkweed)

  1. Do the caterpillars eat the sticky white flowers on the swan plant?

  2. I have heaps of white small bugs what should I do.

  3. I have 6 large swan plants.. Some 6 feet high.. Can one prune a swan plant to a reasonable size.? I have a few caterpillars but notice they are actually freezing on the plant..Thanks Bev..

    • Yes you can, but please remember to wear gloves and be careful of the toxic sap that could spray into your eyes. It’s better just to snip off the wooden looking branches.

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