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Plants don't typically pull lead out of the soil through their roots. Your main concern should be surface contamination from soil getting splashed onto the plant when it's watered / rains

This is why one always rinses plants off before consumption.

Here's the standard advice: https://extension.oregonstate.edu/gardening/soil-compost/sho...

If soil lead is sufficiently high, leafy greens and root vegetables are not recommended.

Sunflowers are known bioaccumulators.