That's Yucca. No species of Yucca has spines.
Assuming you are talking about one you are growing as a house plant, it is
probably Yucca elephantipes. It does not make a particularly good house
plant as compared to Dracaena. Yuccas need as much light as you can give
them, such as a south facing window or a greenhouse, to do well.
Let the plant dry out. Over watering it should not have caused such serious
damage within one week. Something else is wrong with the plant. Your plant
may have rot.
http://www.hortworld.com/yucca.htm
"Karen Ferris" <karen.ferris at ntlworld.com> wrote in message
news:3AB8DAB6.852E82B at ntlworld.com...
> please help,
>> I have a Spineless Yukka and during my holiday last week a neighbour
> over watered it, i have re poted it but all the stems are droopy and i
> am at my wits end.
> Please please help as the plant was given to me by my gran who died
> recently. I want the plant to come back to life any advice will be
> grateful.
>> Thank you karen Ferris
>> ---
