In recent years there has been a big rise in the number of people growing food in containers. While it’s hardly a new trend, container growing is a practice that’s gaining in popularity for a number of key reasons. More and more people are choosing to rent rather than buy a property, average land sizes are shrinking, and the population is aging. Growing food in containers is an effective way of reaping a harvest without the need for a traditional vegetable garden or orchard.
Container growing has some clear advantages over gardening at ground level. First and foremost, containers are mobile. When you move, it’s possible to simply put your containers on the back of a truck or trailer, and take them to their new home. Containers require little space. You’d be surprised how much food a container garden can produce from a paved courtyard or a balcony. And for those who find working a garden at ground level difficult, containers can be a god-send, enhancing ability rather than focussing on disability.
But it’s important to realise that container growing isn’t without some pitfalls. Pot plants require more care than those grown in soil. They typically need more water, to the point that if you forget to irrigate on a hot summer’s day, some of your plants are likely to either become badly dehydrated or die. But on the other hand, if poorly drained containers become waterlogged, plants can die from having “wet feet”.
Another easily overlooked issue is that container grown plants can be less nutritious than those grown in well managed soil. As they grow, plants draw nutrients from the soil and transfer them to their leaves, roots, or fruits, which then get passed on to us as we eat them. Healthy soil equals healthy plants, equals healthy food equals healthy people.
By contrast with well managed soil, a premium commercial potting mix is a soil-less medium that’s usually made primarily from composted pine bark and sand, with the possible addition of components such as peat, coco-fibre, slow release fertiliser, wetting agent, and water crystals. Potting mix is usually pasteurised using steam. This kills all the pathogens that might have been in the mix, but also destroys any good bacteria that help plants take up essential nutrients. As a general rule then, you’ll get more nutritional benefit from food grown in soil than food grown in potting mix.
Savvy container growers have cottoned on to this fact and make their own nutrient rich potting mix. Traditional gardeners sometimes use the loam-based John Innes formulas that are still the standard in Britain, and others modify a commercial mix with additions like home made compost and rotted manure. The idea with all of these approaches is that nutrients are made freely available to food producing plants, and subsequently, to people. To keep plants well fed in the longer term, I use organic slow release fertiliser or pelletised chook manure, and for quick growing vegies, nothing beats liquid fertiliser made from fish emulsion or worm juice.
When it comes time to contain your mix, there are dozens of different options. Choose what suits your style and personality, but if in doubt, keep it simple, and classic. There are all kinds of containers in my garden, but I have a preference for half wine barrels and those that are made from traditional unglazed, unsealed terracotta. I can’t emphasise enough how important it is to avoid wet feet – many plants are just as likely to die from too much water as they are too little. Always make sure a container has adequate drainage holes in the base, and only use a saucer for those plants that thrive in damp conditions. Pot feet are usually helpful.
Beyond that, you’re limited only by your imagination. Pretty much any vegetable can be be raised in containers, including those that are grown for their roots, and lots of fruiting plants are suitable as well. Go for dwarf trees or those grafted onto dwarfing rootstock, fruiting bushes, canes, and perennials. And of course, remember to include herbs in your container garden. Most do just as well in a pot as they do in the ground and some perform even better.
A lack of space or mobility doesn’t need to be impediments to growing your own food. If all you can manage is a pot of mixed herbs grown on a sunny window sill, that’s absolutely brilliant. Grow those herbs with pride, and cook them with love, and guess what – you’ll join the ranks of gardeners around the world who’ve discovered the incredible joys of growing their own food.
First published in the Toowoomba Chronicle 12th November 2011. Photo by Justin Russell, potted Eureka lemon.
