
The male Brimstone butterfly is yellow; the female is pale green. It's easily recognised by the unique shape of the wings.
This butterfly always rests with the wings together.
months seen in my garden: mainly August but watch for them passing in March
garden plants that attract this species:
Bluebell, Buddleia, French Marigold, Hyssop, Pelargonium, Pot Marigold, Red Campion, Sweet William
First Brimstone butterfly seen 18 March 
      First Brimstone photographed 26 March 
      Brimstone camoflaged 
      by foliage in garden, 24 April 
      Brimstone, 26 June 
      
      Brimstone on Buddleia Nanho Blue, 2 August 
      Brimstone, 3 August 
      Brimstone, 15 August 
      Brimstone 20 September 

The above photograph was taken on 21 August 2004. I was on a short break from hospital where I spent 4 months having chemotherapy. Consequently, this was the only Brimstone image taken in 2004. The plant is Hyssop.
There are 24 digital images of Brimstones in my 2003 catalogue.
 
      Feeding on French Marigold 
      'Naughty Marietta'. August 4.
 
      Feeding on Sedum spectabile. 
      September 4.
 
      Feeding on Pot Marigold. 
      August 6.
 
      Wing shape is one of the distinguishing features. On 
      Buddleia. August 6.
 
      Camoflage - same colour 
      as the Sedum leaves. September 4.
4 May 2002 on Red Campion
      21 April 2002 on Bluebell
      27 July 2001 on Buddleia
      16 September 2000 on Pelargonium
      22 August 2000 on Marigold
      22 August 2000 on Buddleia
      22 August 2000 camoflaged under 
      Dogwood leaf
      7 August 1999 on Pelargonium
      28 July 1999 on Sweet William
Brimstone butterflies hibernate over the Winter. Look out for them on the wing in March when they are searching for a mate. I find that they don't usually stop in my garden during the Spring but can be seen flying by.
The best chance of seeing Brimstone butterflies in my garden is in August. Usually I will find one on a Buddleia at some time in August.
Enjoyed watching a male Large White butterfy taking an interest in a female Brimstone butterfly on 4 September 2003. He chased her around the back garden until he finally gave up.
Size: 58mm (similar size to Large White - see list of butterflies by size)
First Generation flight period: July until June of the following year
    
 Habitat:
      Larval Food Plants: Buckthorns
      Wild Nectar Plants: Bluebell, Red Campion, Wild Garlic
Family Group: Pieridae - see list of butterflies by family