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Replies
The Hard wearing looks like a mix of ryegrass (fast establishing) and creeping red fescue which is slower to germinate but provides a more robust grass which is anchored by rhizomes - it could be down to the colder night temperatures but Hurrells are a reputable company so you could always ask them the question. Most seeds in UK will come from a handful of UK & European suppliers and most suppliers will have a purity or a % guarantee of germination for their stocks....
Richard@Progreen
It could be down to many factors, certainly weather and night time temp's play a big factor but also how have you prepared the area for re-seeding? Has the client watered correctly? I'm getting germination of Rye within 4 to 7 days and the finer grass within around 14 to 21 days.
Seedbed preparation is key to survival of the new seedlings, overseeding into a warm, moist, seedbed and ensuring that the seed has good contact with the soil, help ensure a rapid germination, development and growth of the new seedlings.
If the correct levels of temperature, nutrients and moisture are present, seed will generally germinate in up to fourteen days.
Different varieties are faster than others and different soil temperatures will also affect germination rates.
Generally hardwearing seeds such as Perennial Rye-grass (Lolium) will germinate faster; in seven to ten days and require soil temperatures 6 degrees and above.
Finer grasses such as Fescue (Festuca) and Bent (Agrostis) will take longer at least ten to fourteen days and require at least 10 degrees to germinate.
Hard wearing, winter hardy and drought tolerant grass such as Smooth Stalked Meadow-Grass (Poa pratensis) can be hard to establish and is best left until late Spring or September, however requires higher soil temperatures.
Hardwearing grass - Perennial Rye-grass
Fine lawns - Fescue and bent grass
Drought tolerant - Smooth Stalked Meadow-Grass
Shady areas - Fescue grass
Water daily if no rain is present for six weeks to aid germination and survival of seeds
Read more on the subject on my blog post - How to overseed your lawn