I’ve always grown plain and golden Feverfew but when A moved to this garden it had this double flowered form which seeds everywhere. I let it grow anywhere when young as it’s leaves are often evergreen near the soil, and then I only pull out wayward ones when they get too big. I also pinch them all at different times to get a constant rotation of flowers through the year. It’s been know to flower in a mild December. I’m trying to keep it away from my own main garden so it doesn’t spoil the single flowered ones I have there, as each has their own beauty and I like the insects to have plenty of single flowers.