Caterpillar growth spurt

The other day, I admired how lush (beautifully green) my butterfly garden had become. My tall swan plants were all getting quite bushy, some with clusters of delicate white and purple flowers. So I arranged the plants (they are all in pots) and tidied everything, topped up the potting mix, swept up, and watered all the plants. It looked amazing. For a whole day!

Now, suddenly, I have a caterpillar population explosion! Again. This is the third time this summer I have found myself with more caterpillars than I can count. (It is probably the last time, as there are usually three generations of butterflies in a season.)

This is what happened. The other day, I had three or four enormous caterpillars. I admired them, photographed them, chatted to them about how fat they were. As well as those ones, there seemed to be about 20 medium-sized caterpillars, a bunch of little ones, and eggs here and there under leaves and so on. In the space of a few days, my enormous caterpillars gobbled a last meal and found places to pupate (turn into a chrysalis), while the medium-sized ones became fat, and all the little ones got bigger too. Now they’re all more noticeable and easy to see on the plants. And it seems as though they appeared from nowhere!

The other reason they’re more noticeable now is because they have stripped the leaves off several of the smaller plants, so there’s nowhere for them to hide. And they are noticing each other. They seem to eat even faster when there are a lot of them together, probably in case the leaf they’re eating is their last meal!

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In the beginning… Part two

After my plants were almost destroyed, I started to rotate them (they were eaten so quickly, most of them never made it out of their pots – the ones I planted out, I dug up again to save them from the hungry hordes). Rotating the plants involved letting the caterpillars have free rein on about half of the plants and keeping the others aside. This method generally worked OK, although, sadly, I did lose some caterpillars to hunger (I couldn’t find any more swan plants and the caterpillars wandered off in search of food and did not return).

I found out late in the season (March 2013) that caterpillars over a certain size (2cm long) can eat slices of raw pumpkin when swan plant leaves are in short supply. So my last few caterpillars ended up inside the house, with a diet of pumpkin and cut leaves, alongside several chrysalises that I’d rescued or simply moved in the hope of seeing the butterflies emerge.

'Rocky' checks out a dehlia
‘Rocky’ checks out a dehlia

I ended the season with 15 stalks that had once been swan plants (and they did not all recover), caterpillar poo on my desk, and empty chrysalises on my wall. Also, I had spent hours managing caterpillar feed, counting and hunting for lost caterpillars, nurturing plants, and staring through the viewfinder of my camera waiting for something to happen.

But I had laughed at caterpillars munching ferociously, jostling with each other as they fought over a leaf, and wriggling quickly across the hot concrete path. I had been transfixed watching butterflies emerge from their chrysalises, dry and test their wings, and take their first flight. And, to top it all, I had taken some pretty cool photographs.

One of my first movie stars
One of my first movie stars

So, instead of being put off, I was hooked. This season (2013/14), I upped the ante. I raised some swan plants from seed, so I wouldn’t run out of plants, and enclosed an area of our courtyard with windbreak mesh, to provide protection for my swan plants and the caterpillars and butterflies alike.

It’s not 100% finished yet, but my vision is of a garden filled with nectar flowers, lush green swan plants, and, of course, fluttering butterflies…. Wish me luck!

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