Haven't noticed this, but an interesting topic. And the plants weren't even touching? I guess it's possible with plants that are aromatic that the scent might get transfered to a nearby plant.

If the tomatoes did turn out spicy it might save on using peppers in the pasta sauce, lol.

Interesting to hear more responses.

The oregano and nasturtium are touching in some areas, but the spiciness is in the leaves that are not touching as well. It isn't the scent being transfered it is definitely just the taste. The scent of the oregano is as per usual. When you first put it in your mouth, it tastes like oregano. It is the aftertaste that hits you.

Leafy greens that tasted of arugula were mostly not touching.
Wonder if there is a market for spicy oregano?
I'm still looking forward to other interesting responses as well!!
Tina

Broccoli and cauliflower were grown for a few years on a field in my area. The next owners planted strawberries and they tasted of cauliflower. They couldn't sell the berries.