Fill them with potting soil.

他们盆栽土填土。

He rooted the tulip bulbs in potting soil.

他把郁金香的鳞茎种在盆栽用土中使其生根。

He rooted the tulip bulbs in potting soil.

他将郁金香球茎植在盆栽土里，等着生根。

Potting soil, mixed with ingredients to lighten it, is put on top.

混合了减轻材料的盆栽土壤放在顶层。

One popular planting mix combines one part potting soil with one part perlite.

其中一部份结合流行的组合盆栽种植土一部分珍珠岩。