There are a dozen questions to answer first...
What kinds of landscapes interest you? Do you see things wide or tight, or both? Do you like to travel light or have everything with you? What's your budget? Do you prefer the prime experience or the flexibility of a zoom? What's your favourite cartoon character? Do you have a family and are you busy and distracted? Do you have lots of time? Do you like tripods or hand-held? Do you use filters? Do you go out in all kinds of weather? How many medals with the Russians win? And so on.
My best landscape shots were taken at 28mm. No, it was 15mm. Hmm, it was 325mm. Actually it might have been 70mm. What lens did I have with me? What options did I see in the scene? I took the picture.
It really doesn't matter, especially if you shoot at f8. The best lens is the 18-55. It saves you lots of money, weight and trouble. But if you want to shoot at 10mm, it's not so good. Or 400mm. But you should answer all those questions.