How to travel to Ashikaga Flower Park

I will be in Tokyo mid April 2013. I wish to go from my Ikebukuro hotel to Ashikaga Flower Park to view Wisteria flowers. Which is the easiest and economical public transport to go for it ? According to some web info, It seems complicated as I need to change several trains via different train lines, so do I need to buy separate train tickets for each train line ? Or just one ticket to cover the whole journey ? Thank you if anyone can share some good advice . thank you

It is explained here:
http://www.japan-guide.com/e/e3850.html#jump_access

so do I need to buy separate train tickets for each train line ?

Usually you have to buy separate tickets for each separate railway company rather than line. Alternatively, you can use an IC card such as Suica and Pasmo to easily make the trip (except if you take the shinkansen).

Web search show this
1) Taking JR Saikyo line local from Ikebukuro to Akabane,
2) then take JR Utsunomiya line Rapid Rabbit to Oyama,
3) then take JR Ryomo line to reach Tomita

can I buy train tickets for all the 3 rides together at Ikebukuro station ? Are they all from same company ?

can I buy train tickets for all the 3 rides together at Ikebukuro station ?

Yes.

Are they all from same company ?

Yes. JR is the company name.