This popular springtime flower can actually be toxic if ingested in large quantities and can be particularly harmful to cats, dogs and horses. The bulb of the tulip contains glycosides and alkaloids that can cause nausea, dizziness and abdominal pain. Severe poisoning can lead to convulsions and possibly death.
What is the effect of vinegar on plants? A: Vinegar is an acidic solution that removes the waxy coating on a plant's foliage, leaving it vulnerable to drying out. Low concentrations of vinegar burn only the foliage, leaving the roots alone to regenerate when possible. Stronger concentrations can burn the plant all the way to the roots. Continue Reading.
http://www.howtogetridofstuff.com/outdoo... Suggestions One way to control it is by cutting it down to the ground several times a season. This will eventually starve the thistles tough plant roots and kill it. One method that can be used in small areas is to inject white vinegar into the center of the thistle.We use a veterinarian type syringe to do this so the solution is in contact only with the target plant.his has worked so well that after several applications the thistle shrivels up, dies, root and all. Vinegar does act as a soil sterilant so you must be careful what it contacts. If you can find 30% acidity vinegar, this is the best to use versus the store brands with about 5% acidity.