Looking at a circular email from the Horticultural Trades Association I thought it would be appropriate to reproduce it here. This has never passed over my desk before and while the chances of there being a problem are perhaps small I would like to spread the word in case it helps some poor soul who is scratching their head wondering why their crops have failed this year.

Anyone who has access to farmyard manure should take careful note, and then ask diligently of your supplier about what chemicals have been used.
This is an explanation of how the grassland herbicide aminopyralid can have an effect on your plants.
There have been a number of stories in the local and national press about the aminopyralid, sold in mixtures as a range of products.
This has been implicated in causing damage to allotments and gardens via manure.

The product is applied to grassland to control perennial weeds such as docks. It is known that any traces of residue left on the grass pass straight through livestock grazing on the grass or silage.
It then binds strongly to plant tissue like straw in the manure and so does not break down.

If this manure is applied to susceptible crops such as lettuce, legumes and tomatoes then damage can result. The label clearly states that any manure or slurry from animals grazing on aminopyralid-treated grass should only be applied to grass, cereals or maize.
Anybody selling manure from the farm needs to be aware of this and follow the label advice.

On retail shelves you will see SBK weedkiller which notes on the pack that grass that has been sprayed with the product should not be used on the compost heap.

It is vital to read all the instructions before you start to use a product and adhere to them closely for fear of causing problems later.
Let's look at something a little lighter.
You can always tell who is doing the most work on their hanging baskets and tubs in the form of dead heading. Removing flowers that have passed their best does a couple of things.

Firstly it instantly lifts the look of the container. Taking away the worst of flowers and foliage leaving only the better growth is always worth doing.

Secondly, a plant that is not spending energy in seed production will have more to spend on flower production, so removing flowers before seeds are swelling is always a good idea.
Keep feeding your plants with a high potash feed. It is this element that is responsible for flower production in plants so something like a tomato feed would be good as this works by encouraging more flowers to give more fruit.

Rose food is also high in potash so can also be used as a feed for other flowering plants.
As these two are volume sellers they will often be on a special offer and may work out cheaper than buying something like a supposedly specialist tub and basket feed which will have a very similar analysis.