How to fill the lanscape lines with auto generated foliage!

Hello epic community ! I came across with an issue with the auto generated foliage plugin(Blueprint). It’s generated some of the foliage but not on the entire surface that I’ve painted with the specific material and so, remained some straight lines on the landscape since it’s a big one. I don’t know exactly what should I do to generate even on those lines. If someone had the same issue and found some solution please share it .Thank you in advance and Merry Christmas to you all !