If you’re looking for a living alternative to edging your garden beds instead of using commercially available edging, why not consider using edible plants. Then you can reap the harvest of your living edging as well as creating an attractive border for your garden beds.
There are a number of fruiting plants which typically grow as shrubs and therefore lend themselves well to hedging.
For low growing hedges you could try Chilean guava (max 1 meter), blueberry (height depends on variety – choose a small growing one), currants (1.5 meters), gooseberries (2 meters) or mountain pepper (this is an Australian native and grows from 2-5 meters) to name a few. With all of these you can keep their height in check by regular pruning.
Tall hedges can utilize plants like pineapple guava (can grow to 15 feet tall if left unchecked but is best pruned to keep as a shrub), strawberry guava (can also grow to 14 feet but since its slow growing is ideal for pruning to keep the height in check and produce lovely bushy growth) or even olives (height depends on the variety) or pomegranate (can grow to 12 feet tall but are easily trained to hedge height by regular pruning).
When purchasing your plants, look for small bushy ones and avoid any which have long, lanky growth as you want to train and shape your hedges from young plants to encourage attractive shapely growth. Give them a general tip prune before planting and then just continue to tip prune as they start growing to ensure continued bushy growth.
Until your plants are well established, fertilize often with a fertilizer high in nitrogen as this encourages leaf growth.
Herbs can also be very useful as edging plants especially if mass planted as borders and regularly pruned to keep them manageable and to encourage an attractive growth habit. Consider herbs like rosemary, oregano or thyme. The benefits of using herbs as borders are they can be kept quite compact and you can use the prunings in your cooking as well.
If you have a rose garden why not consider edging it with mass plantings of chives. Not only can they look quite attractive when they are in flower but they have the added benefit of keeping the aphids away from your precious roses as well.
If you don’t mind having a changeable border you could even try using loose leaf lettuce. You can get a variety of colors so you can either use the same variety to create a more formal look or mix them up for a bit of added interest. Just pick the outer leaves for your salads or sandwiches as this will also encourage more growth and keep your border looking good for longer.
Perennial vegetables could also be used as edible borders. This would work very well if you live in a frost free area. You could try capsicum (sweet pepper), chillies, artichokes or even asparagus. Radichio is another very attractive perennial vegetable and would make a wonderful, colorful border .