
Great for small courtyards or balconies!
Here are some Yellow Pear tomatoes, purple and green basil and lettuce growing in an old recycling tub, (thanks Paula for the tub, and thanks Abby for the tomato seedlings!). It's actually a worm farm at the same time.
This is very easy and cheap to do and you can use any large-sized container:
1) Drill some extra drainage holes in the bottom so water will drain through.
2) Put a layer of stones/broken crockery/anything similar in the bottom to further assist drainage (most vegies do not like wet feet!). It's also a good idea to have the bottom of the container raised up slightly on some bricks or stones so that extra water can easily escape and your worms won't drown.
3) Add some compost - I made my own but you can buy organic compost. In South Australia I supplement my own supply with SA Composters' compost.
4) Add a layer of "bedding" for the worms - I used shredded newspaper and some old straw, and some scrunched up used brown paper bags.
5) Add more compost, and also any food scraps you have from the kitchen, in small pieces. Anything that was once a plant is fine, although apparently worms don't like strong smelling things like onions or garlic too much (mine aren't that fussy!) Make your final layer just compost so that the food scraps won't be in your way for planting seedlings.
6) Water well and mulch with straw, or even newspaper. Check your drainage.
7) Once your compost/worm food mix is moist but not too soggy, you can add your worms. I initially bought a box of worms ("red wrigglers") from a garden centre a few years ago, but now if I'm starting a new tub I just take a few from an established tub, and they soon multiply! Better to add just a few at first, and they will then regulate their own numbers to suit the food supply.
8) Leave the tub for a week or more. The soil level may sink, so you can then pull aside the mulch and add more compost. Then you're ready to plant your vegie seedlings. Check the label for the amount of space required for each plant, but this is a nutrient-intensive way to grow them, so you can get away with a bit less space than is usually recommended.
Leave a space to occasionally add some more food (cut up kitchen scraps) under the mulch for your worms.
9) Watch your vegies grow as the worms eat the scraps and general debri in the compost, and as they feed the roots of the plants with their nutrient rich worm poo! Remember to keep the soil as evenly moist as possible. I often use clean rinse water from the household.
I've also grown cucumber, spring onions, chives, silverbeet and rocket in these tubs. If growing them from seed, I just move the mulch aside and add some seedraising mix to the top just before sowing. I keep the tubs under a lemon tree in Summer. In Adelaide I have an excess of UV light, and the tomatoes actually do better under some dappled shade!