Nick M
Google
My wife and I visited at the beginning of April, at the peak of cherry blossom season. We knew full well that we were effectively visiting out of season for the park, so our expectations were measured but it was fantastic. They did a great job of making up for the lack of wisteria with beautiful, vibrant displays of pansies and tulips. It's definitely worth visiting at this time of year. We will be sure to return for the wisteria at some point though, because just looking at all the bare wisteria trees tells you how amazing it would be.
There are a selection of restaurants on site, including a diner style option (where you can get wisteria flavoured ice cream - quite subtle, not overly floral) and more "sit down" style ones that serve things like Japanese curry.
Toilets are plentiful and the whole park appears to be wheelchair accessible. There's also a decent amount of parking available, though I imagine it struggles during wisteria season.
Another highlight is the gift shop(s). There are a wide array of different souvenirs available, including Tochigi specialties. You can also buy flowers there, though you should note that the flower shop and souvenir shop are separate and have different registers.
The staff, as you'd expect in Japan, are excellent. Very friendly, helpful and efficient.