30 different plants per week is very easy. I think it would be hard not to. All you have to do is vary your 5 a day:
Day 1 apple, tomatoes, cucumber, carrots, broccoli,
Day 2 blueberries, banana, red and yellow peppers, courgettes
Day 3 orange, avocado, salad leaves, aubergine, chard
Day 4 grapefruit, pear, butternut, red cabbage, fennel
Day 5 melon, raspberries, spinach, sweet potato, cauliflower
Day 6 blackberries, mango, kale, parsnip, peas
Day 7 tangerine, strawberries, beansprouts, sugarsnaps, pak choi
Add brown, wild, red rice, quinoa, various nuts, fresh and dried herbs and spices, onions, leeks, garlic, pulses, beans, chickpeas etc and you are easily past the target.