Dandelions need sun and light soil to grow well, however they will grow in any type of soil partially recently disturbed soil. So, having deserted the herb garden you will find them everywhere and how they relish it.
How they spread:
After they flower, they produce a seed head that blows on the wind or even a slight breeze. It has been estimated that a seed will travel up to a hundred miles. How they worked that one out, I have no idea. What I do know is that last autumn we had sand on our cars here in Oxford that had blown over from North Africa, so anything is possible. Dandelions are a master of endurance and you may be dismayed of never getting rid of them. However, they are ways of controlling them.
Getting rid of Dandelions must be treated as warfare with its goal: total annihilation of the plant. You must approach the task with a harshness and iron will, ferociously obliterating the Dandelion in your garden
How To Control Dandelions:
If they are in your lawn, you may think to your self: I will mow them to death. However, what happens is the dandelion just grow shorter. Keeps it head down, in other words. It was Darwin himself who first noticed this. So mowing is a no goer.
If you are into spraying chemicals, “Roundup” is the best. However, do be aware that “Roundup” will kill any thing that it touches and that includes Oak trees. So when you use it make sure that they is no wind at all.
Pouring boiling water will kill dandelions. You must make sure that you have enough boiling water to soak the plant, root and all. You should see results of this within four hours. The leaves will start to go brown.
Make a mixture of Isopropyl alcohol, that is rubbing alcohol, which can be bought at your local pharmacies. Mix two tablespoons of alcohol with two pints of water: put it in a spray bottle and spray until the Dandelion is dripping wet. The best time of the day to do this is midday on a hot afternoon. The plant will show signs of withering within two hours.
I use a mixture of vinegar and water. The mixture is: two pints of vinegar with a dash of liquid soap and two tablespoons of lemon juice. I put this in a hand help spray bottle and spray dandelions when ever I see them. The plant will die, never to return. However, others will spring up else where in the garden.
Dandelion are very easy to dig out.
The main way of controlling Dandelions is to never let the flowers turn into seed heads.
It Is Not All Bad:
Like every plant, Dandelion does have many uses, none of which I have tried.
Apart from using the leaves in salad one of the more useful ones in my view is extracting rubber from the plant to make tires for motor cars. Yes, you read it right:
Dandelions contain rubber, however before you rush out to your garden you may want to know that British plants do not contain enough to make it worth while. It is the Dandelion grown in Russian that contain the rubber.The milky sap is found in the root of the plant.