This daisy-like weed is quite sweet and unassuming, but like its cousin the lawn daisy, carrot weed can become a problem if left unmanaged in your lawn. Native to Australia, and found in all states, this weed goes by many different names – carrot weed, Batchelor’s Button or annual buttonweed, to name a few – most of which describe the weed’s physical attributes.
Getting rid of carrot weed is possible by both manual and chemical methods. You should choose the best method for your situation. 
Like most weeds, carrot weed will thrive in poor lawns, so the best approach is to maintain the health of your soils and lawn through good cultural practices. 
What are Perennial Weeds?
Perennial Weeds are longer lived plants that can survive winter or regrow from roots, rhizomes or tubers in spring after a period of dormancy. Many weeds that grow from seed ...
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Also known as Common cotula, Batchelor’s Button or annual buttonweed, carrot weed is an Australian native plant that is known to grow in pastures, gardens, lawns and playing fields.
Carrot weed often becomes a problem when your lawn is bared during renovation. It thrives in damp soil in a sunny location and is even known to grow in damp crevices at the base of buildings or in between pavers. The name carrot weed derives from the similarity of its finely divided leaves to those of carrots.
Carrot weed spreads by seed, and management should focus on removing the seed to prevent dissemination. Seed germinates from autumn to spring and the plants grow rapidly, producing flower stems in late winter to spring and flowering soon after. Plants usually die (annual) or the top growth dies (perennial) as summer approaches.
