New lawns can be easily damaged by lawn herbicides so avoid using them within six months of seeding or turfing. However, products containing fluroxypyr (eg. Weedol Lawn Weedkiller) isclaimed to be safe if applied two months after sowing or laying turf. The new lawn must be growing well. Where dandelions areout of control in a garden or are simply growing in the wrong place, control may be necessary.First, consider whether this can be done using non-chemical means such as digging out and where thesemethods arenot feasible, chemical controls may need to be used. Apply glyphosate as a spot treatment to individual plants or spray areas that have been cleared of cultivated plants Try digging out isolated specimens, removing as much of the tap root as possible early in the spring. Dandelions can regenerate from fragments of root so it may require several attempts to completely remove a deep or awkwardly positioned plant. There are many specially designed tools to help with removal. Dig plants out as soon as they appear and don’t allow to flower and set seed. Weedkillercontrol

Weedkillers for gardeners (Adobe Acrobat pdf document outlining weedkillers available to gardeners; see sections 1a, 1b, 1c and 4) Links

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Glyphosate is a non-selective weedkiller applied to the foliage, where it is translocated throughout the weed. Tougher formulations are worth trying (e.g. Roundup Ultra or Rootblast Super Strength TotalWeedkiller)

Being non-selective, it is essential to avoid spray drift onto neighbouring plants. It is important to have good leaf coverage so that as much chemical is absorbed as possible The RHS believes that avoiding pests, diseases and weeds by good practice in cultivation methods, cultivar selection, garden hygiene and encouraging or introducing natural enemies, should be the first line of control. If chemical controls are used, they should be used only in a minimal and highly targeted manner. Culturalcontrol Use a selective weedkiller which contains triclopyr (eg. SBK Brushwood Killer) as this would leave the grass unharmed. However, other broad-leaved plants will be damaged (e.g. wildflowers) and so should only be used in grass where such action is acceptable