gojis are best in a large roomy pot or ground and like sun, try to use rain water where possible, they may be water starved if pot to small as roots will demand more water and nutrients than the compost can hold. when repotting add some potash and bone meal around the soil near the top and add liquid grow more about once a fortnight. mine are doing well on this diet. re your blueberries thet need rainwater for the acidity and an ericaceous fertilizer for feed not a tom or veg and fruit feed and any form of animal manure is unsuitable, good sized pots are paramount again for growth. try to save them if you can good luck.