Pop Tarts on Mars

Join us for an exclusive conversation with presenter, broadcaster and author Alan Titchmarsh. Recorded at BBC Gardeners’ World Live, and Hosted by presenter and broadcaster, Nicki Chapman, the audience listened in as Alan discussed what it means to be a good gardener… You can buy tickets for the next live show, BBC Gardeners’ World Autumn Fair here.

Ashley Dove-Jay, University of Bristol

Briardo Llorente, Macquarie University

Header image: Suited up to simulate the conditions of working outside on Mars. Jonathan Clarke (the author, left) with visiting engineer Michael Curtis-Rouse, from UK Space Agency (right). Jonathan Clarke personal collection, Author provided.

A couple of weeks ago, I was looking for some statistics about the average UK garden size, and I found some interesting ones. According to the 2015 media pack for the RHS The Garden magazine, a document that is aimed at attracting advertisers to the publication, the 380,000 RHS members the magazine is sent to have gardens that are 10 times larger than the UK average, covering over half an acre.

Like new potatoes and asparagus, giant American marshmallows are clearly in season at the moment – they’re appearing in all the shops. We spotted them in our local garden centre (!) and, fresh from the success of our inaugural marshmallow toasting, we thought we’d set ourselves a challenge and see whether we could repeat it with something considerably larger.

In Jade Pearls and Alien Eyeballs I talk about the journeys plants have made with us – crisscrossing the globe and leaving Earth entirely for missions in space.

I’m hoping to go and see The Martian soon, one of the few films to feature a botanist as the hero. Astronaut Mark Watney is one of the first humans to set foot on Mars, but accidentally gets left behind and has to survive on his own – and to do so he grows potatoes. He wouldn’t be the first person (or even population) to rely on potatoes for survival, but here on Earth there’s a slight snag. The potato (Solanum tuberosum) has an arch nemesis – late blight, caused by an organism called Phytophthora infestans. It cuts down both potatoes and tomatoes, and was the biological cause of the Irish Potato Famine in the 19th century.

Ever since we watched Away, Ryan and I have a new toast: “To Mars”. Unlike that fictional crew, we have no hope of ever reaching the red planet. But there are an increasing number of days when I think it would be nice to leave humanity’s mess behind and start afresh on a new world. But the prospect of forming a colony elsewhere in the solar system is a long way off, and when people talk about life on Mars they’re usually referring to alien life. 

The idea that we should be gardening without using peat is not a new one, at least here in the UK. I have a copy of ‘Gardening Without Peat’, published by Friends of the Earth in 1991. It explains that our exploitation of peat bogs is using up peat faster than it is being formed – we should consider it a non-renewable resource. The destruction of the peat bogs is causing a decline in biodiversity and allowing carbon dioxide to escape into the atmosphere to add to our climate woes.

The latest addition to the garden is a Gardman poppy bird feeder. I’ve popped it in the border and filled it with seed for the moment, but it can be used as a water dish in the summer – it’s made from painted cast iron. I was given mine by Gardman for review purposes, but they’re being sold to raise money for The Royal British Legion, as part of their annual poppy appeal. Gardman want to raise £200,000 for the charity, and 50p from the sale of each feeder will be donated. There’s a special bird food range to go with it, also including a donation to the poppy appeal.

Barbara Cavalazzi, Università di Bologna