Towards the end of the South African winter it’s not a bad idea to provide the Spring growth of plants with an organic ‘headstart’.
In Wikipedia you can find a few articles about organic soil improvers.
Look under bone meal and sea weed. Both stimulate the root growth. Good healty roots are the foundation for a healthy growth of the plant.
What’s not mentioned in Wikipedia is the use of composted horse manure; also rich is phosporous like bone meal but not the risk of contamination with lead and so on as some bone meal products.
Sea weed is available in South African shops as SeaGro and in large quatities at agricultural suppliers as Kelpak. It’s a true South African product (Made in Simonstown). Just spray it on plants and soil at the end of August and once more in mid-October. Bone meal: a little hand full around every plant and slightly cultivate it in the soil. Only once a year around this time. And don’t believe what the manufacturor writes on the package (“every six weeks”). Plants can get killed due to an overload.
Composted horse manure: Spread between the plants and with a bit of cultivating mix it with the top soil. Here we are glad with a horse keeping neighbour. Thoroughbreed horses with honest natural food without hormones and other ‘boasters’.
One golden rule: Too much is too much. Relativily small quantities are the best. Don’t make it too easy for plants (they get vunerable for diseases and pests). Life is hard; should also be for plants. That makes them strong.
Keep on talking with your plants.