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Possible improper transplanting technique, root disturbance, root ball allowed to dry out, delayed or inadequate watering after transplanting, fertilizer burn? Or is it a deciduous plant? 4 digit postal code, is that Australia? Are you into the fall/winter season when some plants drop their leaves as they go into dormancy? With no photo or information on the type of plant and the growing conditions, it's impossible for us to know what happened.

Bend some of the smaller branches and if they are still flexible the plant may still be alive and will re-foliate. Scrape off a thin layer of bark from a woody stem to determine if there is a green growing layer still viable. If so, keep up with appropriate watering and give it some more time. Don't apply chemical fertilizer until some new growth appears.

Without a hint about the conditions or your soil fertility and water management program, we can only guess that it is suffering from inadequate sunlight, nutrient deficiencies, and/or under-watering.

The decision on how to re-use grow bags and potting mix is determined by how old the mix is and whether any of your plants in the bags were diseased. If there was disease, put the soil in the trash. To prepare the bags for cleaning, empty the potting mix and let the bag dry for a day or two then brush it to remove debris. Grow bags holding diseased plants should be thoroughly cleaned with a soapy solution and 10% bleach by volume or other sanitizer. Non-diseased bags do not need sanitizer. Some fabric pots are washing machine safe. Rinse and dry well.
Potting mix deteriorates slowly and can be re-used another year, possibly two. Remove stems and roots left in the soil. Mix compost into the old potting mix so that you have 3/4 potting mix, 1/4 compost. Eventually, you will add old potting mix to the compost bin unless it held diseased plants.

Can you send images for us to look at?

You need potting soil, and more sun. That clay will compact, and will not allow for nutrient uptake or air exchange.

Simply change the soil to a light potting soil, and you will see a totally different plant within a few weeks. You may also want to add a horticultural light for a few hours if the condition continues to decline after repotting into a light soil mix.

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