There’s nothing like eating your own home- grown vegetables, and there are heaps of different foods that will re- grow from the scrap pieces that you’d normally throw out or put into your compost bin. Wickedfood Cooking school takes a look at what can be done simply in your kitchen.
Just remember … the quality of the “parent” vegetable scrap will help to determine the quality of the re-growth. So, wherever possible, I recommend buying local organic produce, so you know your re-grown plants are fresh, healthy and free of chemical and genetic meddling.
Leeks, Spring Onions and Fennel
You can either use the white root end of a vegetable that you have already cut, or buy a handful of new vegetables to use specifically for growing.
Simply place the white root end in a glass jar with a little water, and leave it in a sunny position. I keep mine in the kitchen window. The green leafy part of the plant will continue to shoot. When it’s time to cook, just snip off what you need from the green growth and leave the white root end in water to keep growing. Freshen up the water each week or so, and you’ll never have to buy them again.
Lemongrass grows just like any other grass. To propagate it, place the root end (after you’ve cut the rest off) in a glass jar with a little water, and leave it in a sunny position.
Within a week or so, new growth will start to appear. Transplant your lemongrass into a pot and leave it in a sunny outdoor position. You can harvest your lemongrass when the stalks reach around a 30cm tall – just cut off what you need and leave the plant to keep growing.
Celery, Bok Choi, Cos Lettuce & Cabbage
Similar to leeks, these vegetables will re-grow from the white root end. Cut the stalks off as you normally would, and place the root end in a shallow bowl of water – enough to cover the roots but not the top of your cutting. Place it in a sunny window position, occasionally spraying your cutting with water to keep the top moist.
After a few days, you should start to see roots and new leaves appear. After a week or so, transplant it into soil with just the leaves showing above the level of the soil. The plant will continue to grow, and within a few weeks it will sprout a whole new head.
Alternatively you can plant your cutting directly into soil (without starting the process in water) but you will need to keep the soil very moist for the first week until the new shoots start to appear.
Ginger is very easy to re-grow. Simply plant a spare piece of ginger rhizome (the thick knobbly bit you cook with) in potting soil with the newest (ie. smallest) buds facing upward. Ginger enjoys filtered, not direct, sunlight in a warm moist environment.
Before long it will start to grow new shoots and roots. Once the plant is established and you’re ready to harvest, pull up the whole plant, roots and all. Remove a piece of the rhizome, and re-plant it to repeat the process.
Ginger also makes a very attractive house-plant, so if you don’t use a lot of ginger in your cooking you can still enjoy the lovely plant between harvests.
Re-growing potatoes is a great way to avoid waste, as you can re-grow potatoes from any old potato that has ‘eyes’ growing on it. Pick a potato that has robust eyes, and cut it into pieces around 5cm square, ensuring each piece has at least one or two eyes. Leave the cut pieces to sit at room temperature for a day or two, which allows the cut areas to dry and callous over. This prevents the potato piece from rotting after you plant it, ensuring that the new shoots get the maximum nutrition from each potato piece.
Potato plants enjoy a high-nutrient environment, so it is best to turn compost through your soil before you plant them. Plant your potato pieces around 20cm deep with the eye facing upward, and cover it with around 10cm of soil, leaving the other 10cm empty. As your plant begins to grow and more roots appear, add more soil. If your plant really takes off, mound more soil around the base of the plant to help support its growth.
You can re-grow a plant from just a single clove – just plant it, root-end down, in a warm position with plenty of direct sunlight. The garlic will root itself and produce new shoots. Once established, cut back the shoots and the plant will put all its energy into producing a tasty big garlic bulb. And like ginger, you can repeat the process with your new bulb.
To propagate garlic, it is essential to use an organic source since most garlic in today’s supermarkets comes from China and has been irradiated, and won’t sprout which will prevent them from shooting.
Onions are one of the easiest vegetables to propagate. Just cut off the root end of your onion, leaving a 1cm of onion on the roots. Place it in a sunny position in your garden and cover the top with soil. Ensure the soil is kept moist. Onions prefer a warm sunny environment, so in winter, keep them in pots and move them indoors during frostier months.
As you use your home-grown onions, keep re-planting the root ends you cut off, and you’ll never need to buy onions again.
When planted, sweet potato will produce eye-shoots much like a potato. Bury all or part of a sweet potato under a thin layer of soil in a moist sunny location. New shoots will start to appear through the soil in a week or so. Once the shoots reach around 1cm in height, remove them and re-plant them, allowing about 30cm space between each plant. It will take around 4 months for your sweet potatoes to be ready. In the meantime, keep an eye out for slugs… they love sweet potatoes.
To propagate sweet potatoes, it is essential to use an organic source since most commercial growers spray their sweet potatoes to prevent them from shooting.
Mushrooms can be propagated from cuttings, but they’re one of the more difficult veggies to re-grow. They enjoy warm humidity and nutrient-rich soil, but have to compete with other fungus for survival in that environment. Although it is not their preferred climate, cooler environments give mushrooms a better chance of winning the race against other fungi.
Prepare a mix of soil and compost in a pot (not in the ground) so your re-growth is portable and you can control the temperature of your mushroom. I have found most success with a warm filtered light during the day and a cool temperature at night. Just remove the head of the mushroom and plant the stalk in the soil, leaving just the top exposed. In the right conditions, the base will grow a whole new head. (In my experience, you’ll know fairly quickly if your mushroom has taken to the soil as it will either start to grow or start to rot in the first few days).
To re-grow pineapples, you need to remove the green leafy piece at the top and ensure that no fruit remains attached. Either hold the crown firmly by the leaves and twist the stalk out, or you can cut the top off the pineapple and remove the remaining fruit flesh with a knife (otherwise it will rot after planting and may kill your plant). Carefully slice small, horizontal sections from the bottom of the crown until you see root buds (the small circles on the flat base of the stalk). Remove the bottom few layers of leaves leaving about a 2cm base at the bottom of the stalk.
Plant your pineapple crown in a warm and well drained environment. Water your plant regularly at first, reducing to weekly watering once the plant is established. You will see growth in the first few months but it will take around 2-3 years before you are eating your own home-grown pineapples.