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The best way to take exterior photos for textures is when it is overcast. You get uniform shadows which means less editing to get a good result. You can eliminate the shadows in those photos as well in photoshop or gimp, then do color adjustment, combine several takes of the same surface and then make them tilable with a plugin like PixPlant.
It’s all good but one thing. If you really want to make photos tileable, you have to do it manually. Especially with more complex source material, like grass mixed with earth or stones.
Also general tip. If you are using photoshop, good way to get rid of harash lighting is to select it using Color Range and use Fill with Content-Aware option. It’s good for removing very dark shadow and very bright reflections.