Seed sales for edible plants have boomed as many house-bound people have adopted the ‘green therapy’ of gardening. Organic gardening has long been respected for providing healthy outdoor exercise and mental health benefits while providing healthy, pesticide-free produce for your family.
My book Easy Organic Gardening and Moon Planting has been helping gardeners get the best from their gardening efforts since 2006. It provides practical advice on what to grow when in the perpetual monthly diary, and how to get good results in both your vegetable patch and ornamental parts of your garden. It can be used with, or without, moon planting. There are also sections on compost making, worm farming, drought-proofing your garden, and much more. See reviews: My book
Easy Organic Gardening and Moon Planting is available as both a paperback and e-book, and can be ordered on-line, so you don’t have to leave home to find it. Happy gardening, everyone.
This lovely climbing rose is a popular addition to many gardens. The Banksia Rose, (Rosa banksiae) or Lady Banks Rose, originated in China, and is named after the wife of famous botanist Sir Joseph Banks.
An evergreen rose with few, if any, thorns, it is a dense climber to about 6 metres – perfect for covering a fence or pergola. Masses of creamy yellow or white flowers are produced on long canes from spring onwards. The flowers have a delicate fragrance, some say reminiscent of violets.
This vigorous rose needs a well-drained soil in full sun or part shade where it won’t crowd out other plants. First fill the planting hole with water. This is important for two reasons. How quickly the hole drains indicates whether drainage is good or you will need to plant the rose in a raised mound. If the surrounding soil is not damp when you transplant, the water you apply after planting will be drawn away from the root ball into the surrounding dry soil, and the plant will look stressed several days after planting. The addition of compost to the planting hole, and a 5 cm layer of organic mulch to the soil surface, is very beneficial. Keep the mulch one hand width from the stem.
It is a hardy plant but it should be watered weekly for the first couple of months after planting if weather is dry. Then, only water when the top centimetre of soil is dry.
Climbing roses are pruned after flowering. Banksia roses are usually pruned by late summer when the main flowering flush has finished. As these roses flower on last season’s wood, just remove any damaged canes, and shorten the rest of the canes by one third. Hard pruning results in no flowers next spring. Prune new roses during First Quarter phase when sap flow is higher and growth response will be faster.
A common problem affecting otherwise healthy tomato and capsicum plants during heat waves is blossom end rot, where partly formed fruit develops a dark, sunken patch furthest from the stem.
This is caused by calcium deficiency, and is not a disease. Like us, plants need a good supply of calcium to form a strong structure. Hot and very windy days increase transpiration (water loss) from plants in the same way we perspire to keep cool, and calcium can only be absorbed by plants as water-soluble, electrically-charged ions. This problem can also affect zucchini, pumpkin and melon plants.
During heat waves, daily watering rarely solves the problem. A deep watering a couple of times a week is more beneficial. If soil around plants is mulched to keep roots cooler and reduce water loss, an efficient way to water quickly is to place juice or soft drink bottles, neck down, beside plants. See: Watering in drought conditions
Other causes of blossom end rot are:
• Erratic watering
• Soil is too acidic (soil pH less than 6)
• Poor fertilising routine
• Overuse of fertilisers high in nitrogen or potassium, including some seaweed fertilisers
• Rarely, in very alkaline soil where calcium becomes insoluble.
There is nothing like the taste of vine-ripened tomatoes, and this is how my neighbour, Cheryl, keeps her tomatoes cropping through winter on the Mid-North Coast of NSW. The tomato plants self-seeded in the rose garden in front of her north-facing verandah and, as they grew, she trailed the foliage across the verandah surface. The plants get plenty of sun during the day and the verandah roof keeps the plants warmer at night and protects them from frost. This clever idea has worked very well and Cheryl has so many tomatoes, she has been giving them away.
Tomatoes can also do well during the colder months in pots on a protected north-facing verandah, as the potting mix in black plastic pots stays warmer than soil in garden beds. Fruiting on tomatoes depends on warm air and tomatoes do not need bees for pollination. Don’t forget to water the plants regularly, and give them a light application of complete organic fertiliser as flowers start to form, to ensure a sweet-tasting crop.
Have you ever wondered why they were called eggplants? This variety is the reason. The small white fruit, which look like hens’ eggs hanging on a bush, has a delicious flavour but has been very difficult to find in recent years and I was delighted to finally find some seeds. Yates has ‘White Star’ and there is a variety called ‘Easter Egg’ available from an Australian grower on eBay.
Aubergines (Solanum melangena) are a member of the tomato family and require a similar position, soil preparation, and soil pH. However, they require warmer conditions for germination than tomatoes and are usually sown 1 cm deep in small pots in a warm, protected position. The small, white variety produces a compact bush and can be grown in beds or pots. Aubergines need staking because the stems are brittle, and they appreciate a light application of poultry-based, complete fertiliser as buds form. Regular harvesting increases production. Cut fruit from the plant with a 2 cm stem when the skin is firm and shiny.
A strong, healthy root system that allows your tomato plants to absorb enough water and nutrients is essential for producing a good crop and allowing your plants to produce their own pest-deterrents. Tomatoes in their natural state, grow along the ground and will form auxiliary roots along their stems, but our method of growing tomatoes tied to stakes prevents this.
However, you can give them a helping hand to produce extra roots before planting out by lying potted seedlings on their side when they are 10-12 cm tall. Leave them like this for a week or so, depending on the growth rate, and remember to stand them upright for watering. As you can see in the photo, the main stem with make a 90-degree turn, and root buds will form on the horizontal part of the stem. Plant them out with the growth tip vertical and the horizontal stem just below the soil surface. Or, you can remove the seed leaves and plant them up to just below the next set of leaves, then hill soil around them slightly as they grow.
Compost can be made in a variety of containers. The examples below show a double bin made from recycled timber, a double bin made from recycled, heavy gauge bird wire covered with knitted polypropylene shadecloth, and a commercial single bin. Double or triple bins are best as you can turn the compost from one bin into the next, with the third bin used to start a new heap.
Compost tumblers (below, right) do the work of aerating the mixture. They are suitable for composting small quantities of fairly soft ingredients quickly, for people who are not able to turn compost easily, but the mixture may not generate enough heat to kill diseases.
Homemade containers don’t require skilled carpentry. What goes into the compost container is more important than how it looks. The main points to remember in deciding on the size and site of your compost container are:
- When ingredients form one cubic metre (i.e. 1 m. x 1 m. x 1 m.), aerobic bacteria will generate enough heat to kill diseases and weed seeds.
- Open-base bins that are in contact with soil allow earthworms to enter the mixture (when it has cooled down) and provide worm castings to the mixture while they help complete the composting process.
- Recommendations to position compost bins in full sun do not apply to many parts of Australia, as too much heat can kill off composting organisms. A shaded spot is ideal.
- Compost bins need a cover to prevent the ingredients becoming sodden in heavy rain.
Some Composting Tips
If you are new to compost making, don’t be intimidated by statements of the ratio of carbon to nitrogen in compost making. Most recommended ingredients contain a mixture of both. With a little practice, you will quickly learn to identify and correct any imbalances.
- Chop up tough items using shears, a shredder, or a sharp spade (spread items on soil or grass first to prevent jolting). This assists faster decomposition as bacteria work on the surfaces of organic waste. The more surfaces you can provide – the faster they can work.
- The secret to making compost quickly to turn it regularly to keep it aerated, and to keep it damp as aerobic bacteria that commence the process require nitrogen, air and moisture to process the carbon.
- The secret to fast composting is regular turning and mixing of the ingredients. Weekly turning while the ingredients are generating heat will produce mature compost very quickly. As the compost breaks down, the mass is reduced.
- You don’t have to wait until you have a cubic metre of ingredients – turning and mixing ingredients will get the bacteria working.
- If the pile looks grey or contains ants – it is too dry. Turn and mix the ingredients, while adding enough water to dampen the mixture.
- Don’t be concerned about slaters in your compost heap. They feed on semi-decomposed organic matter.
- If the pile is black with an unpleasant smell – it is over-wet. Air has been forced out, and anaerobic composting has begun. Turn and mix the ingredients, while dusting with agricultural lime every 15 cm, and adding some straw to the mix. Protect pile from rain.
- If the pile seems inactive – it may need more nitrogen. Turn and mix the ingredients, while adding some manure every 20 cm. If manures are unavailable, you can substitute a generous sprinkling of poultry-based, organic-allowed fertiliser.
- Your compost is ready when it is dark brown, crumbly, with a pleasant earthy smell and ingredients, apart from pieces of egg shell, are no longer recognisable. A 5 cm layer added to topsoil provides your garden with all the minerals that plants, animals and humans need for good health.
Compost is made by combining organic waste than provides nitrogen and/or carbon. The advice to make compost from waste that is green (provides nitrogen) and brown (provides carbon) is a bit confusing when manure contains a lot of nitrogen, but most of it is brown. When suitable dampened materials are combined in a heap that has contact with the soil, heat is generated and millions of aerobic bacteria get to work transforming the fuel into a compost-making factory.
- Manure from animals that eat grass (lots of nitrogen)
- Chicken manure (lots of nitrogen)
- Weeds without seed heads (nitrogen and carbon)
- Lawn cuttings that have wilted (nitrogen and carbon)
- Green prunings – shredded (nitrogen and carbon)
- Raw vegetables and fruit – chopped for fast break down (nitrogen and carbon)
- Uncooked kitchen waste – including tea bags and coffee grounds (nitrogen and carbon)
- Old plants – chopped for fast break down (nitrogen and carbon)
- Bedding straw for animals that eat grass or seeds (lots of nitrogen and carbon)
- Straw and hay (lots of carbon)
- Cardboard boxes and egg cartons – shredded (carbon)
- Undyed wool, feathers and hair (nitrogen and carbon)
In Small Amounts
- Newspaper and waste paper – separate sheets crumpled or roughly shredded (carbon)
- Woody prunings – shredded (carbon)
- Wood shavings – (very slow to break down and tie up a lot of nitrogen)
- Seaweed – well-washed (helps factory work faster)
- Herbs – comfrey, yarrow and chamomile (help factory work faster)
- Egg shells – crumbled (keep compost smelling sweet and earthy)
Do Not Add
- Plastic or foil containers, wrapping or disposable nappies
- Fruit or vegetables that have been attacked by fruit fly or codling moth (larvae can pupate in factory)
- Plants with diseases
- Cat, dog or human faeces* (these can spread diseases through compost)
- Rats or mice* (can spread diseases through compost)
- Grey water (upsets pH balance and slows process)
- Soil – makes compost heavy and harder to turn (amount clinging to weed roots is sufficient)
- Earthworms – the initial heat will kill them. Earthworms know when to move into a compost factory.
- Synthetic fertilisers (delays process and deters earthworms)
If you only have small quantities of organic waste to recycle, a worm farm would be a better solution. See Compost Worm Farm.
For information on how compost makes garden soil healthy, see Compost.
** Cat and dog faeces, and vermin, can be composted anaerobically in a small pit or container, but this compost should not be added to garden beds.
Composting recycles organic waste into a product that makes garden soil healthy. Mature compost is a dark brown, sweet-smelling material that can be added to topsoil.
There are two ways to make compost – aerobic, which requires aeration during the process, and anaerobic, which is a slow, rather smelly process. Mature aerobic compost can be produced in about 6–8 weeks in most areas of Australia.
How does compost make garden soil healthy?
- Compost keeps soil more moisture-retentive, yet better-drained.
- Compost provides food for earthworms that increase the depth of fertile topsoil by leaving digested food along their deep tunnels.
- Compost provides food and a home for the many helpful bacteria and fungi that help protect soil from soil-borne diseases.
- Well made compost has a pH of 6.5 – where all plant nutrients are fully available, and the perfect pH for the majority of plants.
- Compost buffers plant roots from an unsuitable pH in surrounding soil.
- It also insulates plant roots from temperature extremes so that soil stays cooler in summer and warmer in winter.
- Compost contains all the minerals that plants, animals and humans need for good health, most of the soil’s nitrogen, plus lots of humus that forms the most stable part of recycled organic waste.
- Humus and the minerals that plants need both carry a weak electrical charge. The electric charge holds the plant food minerals close to plant roots and prevents them from washing away in heavy rain.
- Humus is able to control the release of trace elements needed in tiny amounts, and block absorption of poisonous metals in soil so that they do not end up in our food.
- Humus stores carbon in soil for very long periods of time.
- Humus, in compost, provides a habitat for a soil community of billions of beneficial bacteria and fungi that perform important functions.
- Some bacteria species in humus make a ‘glue’ that is able to hold soil particles in a way that improves the flow of water and air through soil. This improves the structure of soil so that plant roots grow more easily. Strong roots help plants to resist the effects of drought and storms.
- Mycorrhiza fungi in humus stick like hairs to the roots of plants, helping them absorb water and nutrients in exchange for sugars produced by plants during photosynthesis. Some 95% of perennial plants rely on mycorrhiza for healthy growth.
This method of frangipani propagation is becoming popular with readers, and one of our readers, Margaret, has been kind enough to share some photos of her very successful efforts.
Why choose this method of propagation? Frangipani grown from seed grow more quickly than trees grown from cuttings and, in the same way a family of children or animals can inherit different combinations of their parents’ genes, plants grown from seed may demonstrate different characteristics of parent plants, sometimes resulting in spectacular new varieties. Plants grown from cuttings are an exact copy on one parent. Not only may the flowers vary in colour or form, we have found that the perfumes of different-coloured frangipani also vary.
We have multiple trees of four different frangipani and the orange one reminds me of the smell of ripe peaches, while the deep pink one has a sweet citrus smell, and the pale pink one hardly any perfume at all.
If your frangipani tree has produced a seed pod or two and you would like to try this method of propagation, you can find more information here: Frangipani trees from seed.