Swallowtail larvae grow very quickly about 3 weeks from hatching to pupating so you should be OK - you could always dig up the foodplant and pot it up in a large cage or sleeved pot and bring it inside. Once the pupae harden you can store them in a cool dark place for the winter.
Best of Luck!

Either the same female Long Tailed Blue or another one with very worn wings, no tails and damaged eye spots was egg laying on my BLSP again today at 10:12 and 13:50. She laid about 8 eggs again on the small flower buds. I also found 2 emerging larvae when I enlarged some photo's of eggs laid last Mo...

Neil Hulme wrote:Nice one, Richard, delighted for you!
BWs, Neil

Thanks Neil! You never know what is just outside your window.

Thanks Bugboy, Spiked Shield bug is a new one on me, 4

On the Surrey Butterfly walk on Denbies hillside yesterday we found a fresh female Brown Hairstreak in the Blackthorn. On closer examination it was impaled through the abdomen by a spike from what we think is a Stink Bug, similar to a shield bug. Has anyone else seen this before and can you identify...

19th August 2019 Long Tailed Blue female egg laying on everlasting Sweet Pea in Godstone Surrey Following Neil Hulme's find of LTB eggs in his garden I have been checking Everlasting Sweet Pea in my garden. I had a nice surprise this morning when looking out of the kitchen window to find a female la...

Thank you,
I now think this is a female Chalkhill Blue, the silver spots were confusing me as I have only seen them before on Silver Studded Blues.

Thank you for letting me join UK Butterflies
Please can you identify the attached butterfly?