Hi all, ive had my yucca for around 6 months. when i bought it, it looked healthy and full. Its around 3-4 feet tall and has 3 trunks, on the tallest trunk the leaves are a deep green but they keep turning brown and drying up so i pull them off( is this good?). On the bottom two trunks the new growth is turning yellow and sagging / collapsing, the base of the leaves are white in colour . I water the plant every two weeks its also not in full sun. Can anyone help as i love this plant and looks really good. thanks bruce.