This clump of flowers and seed pods looks like it's growing wild along the beach near me at English Bay, mixed in with blackberries as it is, but I'm never sure whether the Parks Board deliberately designed the wild-looking landscape. I haven't looked at a radish plant in very many years, and I haven't investigated many Brassicaceae options that this could be, but I quickly came across photos of Raphanus sativus that make me wonder if that's what this is. Maybe even R. caudatus, also called R. sativus var. caudatus and R. sativus 'Caudatus', rat-tail radish? I would taste a pod if that's what this is. White flowers (some purple-ish - are they just old?), four petals, pods around 6cm.
Looks a lot like the rat-tail radish we had in the Food Garden several years ago. You can bring a fruit pod or two next time you're here, and I'll taste it for you.
