Commas are back. Full stop

I have two buddleia bushes at the bottom of my garden. They’ve been in flower for a couple of weeks and, on the odd occasion when the sun shines, I stroll down to check them for insects. 

The buddleia is sometimes called the butterfly bush and the mauve flower spikes are irresistibly attractive not only to butterflies but also to other nectar loving insects like bees and hoverflies.

I’m not sure of the reason for the attraction, obviously the nectaries of the flowers are very productive but I suspect there are other factors, including colour. I’ve noticed that mauve flowers, wild knapweed for example, are singled out by nectar-eating insects. Anyway, the two buddleias in my garden are attractive and I planted them specifically to attract butterflies.