The great great grandmother�s milestone was celebrated at a lunch with her family.
Mrs Mytton Watson has three children, eight grandchildren, 10 great grandchildren and three great great grandchildren.
She said she �hadn�t really thought about� what it felt like to reach her 100th birthday but would enjoy spending time with her family.
Daughter Jane Matthews said her mum was born in England before moving to Kenya in 1939.
�She was married in 1941 to a Kenyan farmer, Terry, and they had three children � us three,� she said.
Mrs Matthews said they moved to WA in the mid �60s and farmed in Esperance.
�After Esperance they went to Gingin and from there they went to Kununurra and then back to Perth,� she said.
�She married a farmer so had a good working life; she worked on the farms with him. And she was a good gardener.�
She said it was �amazing� to see her mum turn 100.
�Her mother was about 98 and her aunt was about the same,� she said.
�We�re having lunch here with a nice cake for her.�
Daughter Pat Watson said they had all inherited their mum�s love of the garden.
�She put us through school selling daffodils and things; they used to be packed in boxes and sent straight to London from Kenya,� she said.
�She�d be there in this icy water putting together these bunches of daffodils in boxes.
�Same with apples and pears, packed away and off they went to London. Vegetables went into the local town, fruit and flowers. She was a busy lady, she never stopped.�
She said her mum also used to do a lot of patchwork and they all had quilts from her.