White Dead-nettle

A common upright perennial to about 0.5m height, being similar in appearance to a stinging-nettle, but it doesn’t have any stinging hairs. It is common in grassland and aside hedges. The flowers are white and the flowering period is from May right up to December. Its scientific name is Lamium album.

  Yellow Grass

A typical sign that the grass has limited nutrition, especially Nitrogen, or limited water availability for healthy growth. This might also be a sign that the grass is starting to die out. It may attempt to set seed as a survival technique. A lack of adequate aeration, especially under waterlogged or wet conditions, can also produce a grass which is yellowing. Nematode damage can also result in turf yellowing; something which is called Yellow Patch.

  Yellow Iris

A common upright perennial, with broad grass like leaves, growing up to about 1-metre, or greater, in height. It habits the edges of ponds, riverbanks and other wet areas. The flowers are split into 3 large separated yellow petals, along with 3 smaller sepals, although as these are all the same colour they are typically referred to as tepals. The larger petals have fine dark orange-purplish stripes at the base. The flowering period is from May to August. Its scientific name is Iris pseudacorus and it also has another common name of Flag Iris.

  Yellow Loosestrife

A common upright perennial to about 1.5m height, being present in damp grassland, especially close to riverbanks. It has fine softly hairy leaf margins, downy leaves, being present in pairs or whorls around the stem. The flowers are yellow with a light orange central region, having 5 stamens and 1 style, with the flowering period being from June to August. Its scientific name is Lysimachia vulgaris.