It’s not a good idea to use rainwater collected from the roof of the house or the greenhouse to water seedlings. It can spread a number of pests and diseases.

Keep a full watering can in the greenhouse and allow the water to reach room temperature before using.

Always check the instructions on the seed packet for the right advice about the plants you are growing.

1.  

   Step 1.

   Fill several clean 7.5cm (3 in) flowerpots with John Innes Seed Compost. Lightly firm down. Water the compost using a watering can with a fine rose (nozzle) attachment.

2.  

   Step 2.

   Sow the seed directly onto the compost surface, spacing it as evenly as possible. Sprinkle a thin layer of compost over the top. Label carefully with the plant variety and the date.

3.  

   Step 3.

   Large seeds can be sown individually in small pots. Make a hole with a dibber or pencil and drop the seed into it. Cover over with compost.

4.  

   Step 4.

   Water gently and keep in a frost-free place until the seeds start to sprout and grow.

There are many other benefits to crop rotation too, legumes for example fix nitrogen in the soil whilst they grow and this is then available for the next crop. It is a good idea to follow these crops with leafy brassicas or potatoes which like a high level of nitrogen.

Potatoes also tend to smoother out weeds so they are unable to grow. Follow these with hard to weed veg such as onions.

Crop rotation does require organisation though and you need to be plan at least for the following 3 seasons. For the best results the further ahead you can plan the better.