No Monarch eggs/cats yet this year
Except for one cat found in the wild, I've had NO Monarch eggs or cats this year. This despite a large stand of Swamp Milkweed. Last year at this time, I had 46 individuals already.
I've seen a couple of adult Monarchs in the yard over the last two days, very fresh-looking, so I haven't given up hope yet.
I'm wondering though about the plants. The more mature plants are showing signs of heat stress (yellow or reddish leaves), while the younger plants are fine.
Is it possible that the Monarchs are somehow detecting signs of stress (perhaps a specific chemical) and simply passing the plants by?