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Once it germinates, I will wait until 4 leaves have appeared before transplanting them to either a big poly bag - at least 12" in diameter or into the ground. Planting in polybags requires more care and attention to water and soil content than in the ground. The leaves feel velvety and have very tiny hairs which can cause you to have an allergic reaction if you inhale it - to me sometimes I experience a sinus reaction to it so I prefer to plant them in outdoor open areas so I have less chances of inhaling them.
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At the farm, we use a liquid mixture of fermented cow dung, organic matter and vermicompost to fertilise them and they seem to love it, producing lots of flowers. We started fertilising them fortnightly starting from 1 week after transplanting. It is important to have strong, sturdy plants as the fruits can be quite heavy, weighing 300-500gm. As with many fruiting vegetables, pollination is important hence be sure to remove old, yellowed leaves to allow easy access for the pollinating insects.
I like to keep a clear ground area of about 2 feet or 20cm diameter clear around the base of the plant. I will build a little circle dam around this, By doing this, it allow me to do a few things: less area to keep weed free, allows for the plant to be the main consumer of the fertiliser and allows the water to be trapped in this circle giving time for the water to seep through the ground to the roots. We water it once a day unless it rains, and depending on the rainfall, we may not water it for a couple of days. This is a hardy plant and can be a prennial, lasting over a year with the right care and attention.
It is easy to know when it is time to harvest, it is when the fruit is a nice purple colour. The fruit is prones to attacks by insects which lay eggs and the larvae then feeds on the aubergine, making holes in them. I use an EM+ spray as an organic pesticide. If it is heavy with fruit, you will need to provide support to the plant as the fruits can get to be heavy - 250-400 gm each - straining the branches.
Now that you have the fruit, what can you do with it. So many options: grilled with olive oil, salt and pepper, turned into a dip, cooked a curry with it, do an eggplant parmagiana (slices coated in breadcrums) and lots of other dishes. I have never seen it eaten in sweet dishes though who knows, someone may one day create a sweet dish out of it. Happy trying to plant this gorgeous plant :)