Tag Archives: monarch butterflies

Monarch caterpillars and butterflies – a mid-life obsession that is safer than a Harley Davidson

The green swan seed pods and the fat monarch caterpillar in high summer

Mark has always loved butterflies. Alas it was his misfortune to be born in a country with remarkably few butterflies so he has had to focus all his efforts on the only obliging candidate, the monarch. When we travel overseas, he likes to be armed with guides to both local birds and butterflies but at home the yellow admiral and the coppers are largely unknown in our area and the cabbage white does not qualify. The red admiral, which is here, is not as much fun because its main host is stinging nettle. New Zealand has an abundance of different moths, many of which are extremely beautifully marked, but you have to be of a nocturnal disposition for these. This brings us back to the monarch which is large, spectacular and can claim indigenous status because it was self introduced (like the wax-eye), arriving here under its own steam, apparently around 1840.

I admit that I fear his dedication to supporting an exponential increase in numbers of monarch butterflies wintering over may be nearing obsessive levels. Even I was a little surprised at the extent of his swan plant plantations. As magnolia crops have been harvested from our open ground area, he has gone in to the cultivated ground with his little seed sower and trundled up and down the rows dispensing swan plant seed. Strung end to end, we are talking several kilometres of swan plants – probably closer to five kilometres than two. What is more, he is successional sowing in the same way he does with the sweet corn and beans. All this is aimed at ensuring that we have plenty of food to take the monarch caterpillars through to late autumn. That way, they are far more likely to winter over here and there are few close up sights of natural beauty as magical as looking up into a tree on a fine winter’s morning and seeing the monarchs waking and stretching in the sunshine.

The drive to have successional crops may strike a chord with many readers who will be struggling now with a surfeit of caterpillars and a dearth of food. There is something both brave and poignant about watching an exodus of monarch caterpillars heading down from a completely stripped swan plant and wriggling off into the wide unknown in search of another. I suspect Mark suffered some emotional traumas in years past, coping with food shortages. One autumn he raised many caterpillars on slices of pumpkin and he finds it hard to cull babies to preserve dwindling food supplies for the more advanced specimens who are likely to reach maturity and chrysalis in time to metamorphose.

Merely sowing swan plant seed is not enough, however. Definitely not. Crops require management. For starters, you want to try and get at least one plant through to its second season so you can gather your own seed. It germinates readily if sown fresh. We have always known the swan plant as an asclepias, Asclepias fruticosa in fact but it has apparently been renamed Gomphocarpus fruticosus which is altogether too difficult for us to remember even with our experience in horticulture. Sometimes it is referred to as milkweed (it exudes a milky sap) but the term swan plant is commonly understood. The seed pod is like a green bubble swan and when it bursts, the fine seeds come out attached to silky white filaments – maybe they resemble white swan feathers? The filaments help the seed to be dispersed by the wind.

The problem with juvenile swan plants is that the monarchs don’t understand about food conservation so you have to protect your swan plants or they will be stripped long before they become established. If you only have a few plants, you can cover them and restrict access to the egg laying butterflies. These days we have so many plants that the supply finally outstripped demand but in the awkward mid stages, Mark did have to resort to a little infanticide to protect the plants for autumn. And we have to be honest and say that our swan plants are not organic. Without intervention in the form of insecticide, the yellow aphids would have destroyed the entire crop before the monarchs even got going. When he first decided that spraying was necessary a couple of years ago, he went through and carefully picked off all the larger grade caterpillars and relocated them to a clean area. These days we just have too many plants so he tries to get his timing right because insecticide is indiscriminate and will kill eggs and caterpillars as well as the nasty aphids. He tries to do it as early in the season as he can before the explosion of monarch caterpillars.

If you only have a few plants or a single plant under siege from caterpillars, it helps to put in a twiggy branch alongside. Too often the caterpillars will chrysalis on the swan plant where they can be very vulnerable to subsequent generations eating off the stem to which they are attached, so it is better that they be encouraged to neutral territory. Our observations are that cocoons must hang in order to allow the butterfly to emerge undamaged. If you have a stray cocoon, you can try tying a piece of fine cotton to its top so you can suspend it. We have resorted to a bit of sticky tape just across the stem at the top of the cocoon which seems to hold them long enough as long as it doesn’t get too wet.

The final piece of the jigsaw for us is having enough food throughout the year to sustain the butterflies. So it is swan plants as host for the eggs and caterpillars and nectar rich flowers for the butterflies. They will just fly away if you live in a green desert with no food for them. I have written before about butterflies feeding in winter on our Prunus Awanui and Edgeworthia papyrifera. There are many flowers with good nectar but I am slightly amused to see zinnias and marigolds making a reappearance here. We haven’t grown these since back in the competitive school garden days of our children but I notice Mark will row them out in the vegetable garden for the prime purpose of feeding the butterflies. In fact the monarchs have caused him to revisit his approach to the vegetable and kitchen gardens and to give space to many flowering plants in order to feed his butterflies. There is nothing as twee as a potager. We are talking more meadow garden style but it is very pretty. The monarchs are a good argument in support of a gardening style which favours flowers twelve months of the year.

Mark is by no means alone in his monarch butterfly fetish. There is a strong organisation in New Zealand to foster the monarch and readers who wish to know more can visit their website on www.monarch.org.nz . This site will also give further suggestions for nectar rich flowers. One of our friendly neighbours has derived much delight from our monarch butterflies visiting his garden in winter, despite Mark threatening to bar code them and charge accordingly. Send our butterflies home, I heard him say. As far is Mark is concerned, his monarch butterflies give him a great deal more pleasure than a mid-life Harley Davidson and are a lot safer and cheaper.

In the Garden November 27, 2009

• Try planting up simple pots as Christmas gifts but get them done now to have them looking at their best in a few weeks time. Punnets of annuals are ridiculously cheap to buy. Planted now, three small plants (plugs, they are called) will fill a pot which measures around 20 to 25cm across. I still remember my splendid summer combination years ago of blue ageratum and cerise petunias. Or you can find cheap herb plants if you want to give an instant herb garden. Ceramic and terracotta pots are inexpensive these days, especially the classic terracotta type despite the fact they still seem to be imported from Italy. This is a good activity to carry out with children and will go down well with grandparents as it shows thought and effort. The cheapest potting mix is fine for annuals but keep the pots well watered and protected from slugs and snails while they settle in.
• With summer coming, set the level on the lawnmower a notch higher. Cutting the lawn very short does not mean you reduce mowing. Instead it tends to stress the grass so the weeds move in.
• If you have onehunga weed in your lawn, you have left it late to spray it but it is the one really bad weed which we think justifies a chemical assault. It is the weed that puts tiny prickles into any bare feet that dare tread upon it. There is a targeted spray called, we understand, Prickleweed Killer which doesn’t kill off the desirable grasses. If there are any children in your life, get onto dealing to it this weekend as your first task. Do not let this weed go to seed.
• Apples will have set their fruit for the year which means that if you had a codling moth issue in the past which you have not done anything about, odds on the larvae are scaling the trunk now to reach the fruit, if they have not yet made the journey. This means it is too late for pheromone traps which are designed to catch the moth before it lays eggs. You will either have to put up with moth eaten fruit or resort to some insecticide spray. Apparently lavender bushes or nasturtiums planted below will discourage infestations in the future but we have yet to see proof of this. It may be worth a try but I would keep to lavender because it is likely that rampant nasturtiums will engulf your entire apple tree. Tipping new growths by hand will largely deal to the leaf curling midge which attacks the very ends. Unroll the leaves and you may find a small pink creature inside. You either nip them off or spray them.
• The end of this month means you are running out of time to plant kumara, yams and any other type of sweet potato. Give these priority along with tomatoes. Potatoes planted now will be a late crop so you don’t want to delay on these either.
• It is four weeks until Christmas so get quick maturing salad vegetables in this week for harvesting at that time. It is much nicer to head out and pick your own mesclun, rocket, microgreens and radishes.
• If you are a fan of monarch butterflies, you will need to get swan plant seed in urgently to get the autumn crop through to feed the late caterpillars. Real enthusiasts will also be sowing seed trays of zinnias, marigolds and other autumn crops of annuals to feed the butterflies.

Prunus Awanui

Prunus Awanui feeding the monarch butterflies this week

Prunus Awanui feeding the monarch butterflies this week

Prunus Awanui is pretty as a picture at our place. This flowering cherry looks like fine lace against the sky, a mass of softest, palest pink, small flowers with not a leaf in sight. We have it underplanted with Rhododendron Elsie Frye which is the same colouring but has considerably larger flowers (and fragrant) and when looked at from further away, we have a Magnolia Iolanthe framed in the view too. All tone in together very well. On a sunny day, Awanui is alive with monarch butterflies, honey bees and waxeyes.

It popped up in a garden where eagle-eyed local nurseryman Keith Adams thought it had potential. It has now become a market standard. It roots easily from cutting, remains healthy and is easy and reliable. With our high rainfalls in Taranaki, we are not the best territory for most flowering cherry trees which tend to be short lived as they develop root problems. Awanui does not appear to be so pernickety despite the fact it probably has subhirtella in its parentage. In good growing conditions, it can get quite large. Our tree is maybe nine metres across and six metres high and would have been larger had it been left to its own devices, but it is a light and airy tree and it flowers faithfully every year and looks completely charming. This is a plant that is generally readily available on the market in New Zealand.