They are quite extensive I would personally give more time for both make them separate visits

Probably best to travel to Stratford by train and tour from there. Stratford Tourist Information should be ably to advise.

Yes!

As with any English garden, you would find little to look at, except bare trees, a few evergreens such as the yews, and a lot of brown clumps in the herbaceous borders which in summer will be flowers! It probably has some winter bulbs like snowdrops, but on a frosty day you might like to just stroll round appreciating the different garden settings. You may find quite a few of the gardens roped off though for safety since they will be wet and slippy, including moss covered stone steps. Batsford Arboretum would be a better bet if it is open in December - worth checking their website!

Suggest you contact property. It would be a lovely spot for wedding pictures.

Many of the early bulbs. Between now and mid march you should be able to see Daphne, Hamamelis mollis, Viburnum bodnantense, etc, many of these spring shrubs have a rich scent. Don't forget the beautiful winter stems such as cornus, Rubus and Betula.

I suggest you try their website. Remember february will be mid winter in the UK.

there are areas which are flat but some areas are not accessible with a scooter as they have steps or really small path ways, the cafes are all on flat land and the first section is flat also, so it is worth it going but be mindful you can't see it all. There is disabled parking right at the front

お天気や好みにもよるとおもいますがお花の好きな方であれば(そして良い天気なら)二時間欲しいところですね。ただし、パッと写真撮って一通り全部の庭を見るだけなら一時間でも回れると思います。チッピングカムデンも20分だけだと雰囲気見るだけで終わってしまいそうですね。

As everyone else has said, there is always something to see whatever the time of year! The garden is abundant in the summer months, so certainly plenty to see, though we would recommend coming on a weekday if you can as they are quieter, particularly Fridays.