Purple caulis, yellow rasps, orange beetroot, white and purple toms, purple goosegogs, yellow courgettes' - most of these are not GM though, they will have been bred using the usual cross fertilisation process. I grow golden beetroot, purple tomatoes, purple gooseberries and yellow courgettes every year - I don't grow yellow rasps as I find they aren't as tasty
Yes I remember all of these from my childhood so they cannot be GM. lovely memories of purple gooseberries in my uncles garden. And iirc the orange carrots were bred to celebrate William of Orange and before that there were more usually purple.
as for yellow rasps- they used to grow wild all round my grandmothers house. many happy days picking them and they are delicious. (Such a strong memory I wrote a poem about it when i was a teenager
)
The yellow mangetout were indeed the heritage variety from real seeds.
and i know the caulis take up a lot of space but they are so satisfying
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plumping also salt- you can spray salt solution on your brassicas. they don't mind but slugs and caterpillars do.
The nematodes are so natural you can make your own if you have the stomach for it.
You can also try leaving piles of oats about. the slugs eat them which distracts them and also there are tales that the oats expand and kill them.
or leave orange and grapefruit peel halves or old squash outsides lying on the ground overnight then pick them up in the morning and bin them. I did it with the halloween lanterns one year and they had slugs crawling in and out the eye holes (and it got read out on GQT ).