A "Topiary Saru plant" likely refers to a Casuarina topiary, also known as the Australian Pine or She Oak, which is shaped into a specific form through pruning. The term "Saru" may be a misspelling or a local name for the Casuarina, which is known for its needle-like leaves and ability to be shaped into various topiary designs, like cones or spirals. 

Here's a more detailed explanation:

Casuarina (Saru) Plant:

The Casuarina equisetifolia, or Australian Pine, is a tree commonly used for topiary. It has unique, needle-like foliage and can tolerate drought and poor soil. 

Topiary:

Topiary is the art of training plants, typically evergreen shrubs, into decorative shapes and sculptures through pruning and trimming. 

Casuarina Topiary:

Casuarina plants are well-suited for topiary due to their dense foliage and ability to be shaped into various forms. 

Common Topiary Shapes:

Casuarina topiary can be shaped into cones, spirals, multi-balls, and other forms. 

Care:

Casuarina topiary requires well-draining soil, regular watering, and occasional fertilization. Pruning should be done in late winter or early spring. 

In essence, a "topiary Saru plant" is a Casuarina plant that has been meticulously pruned and shaped into a desired form, making it a visually appealing element in gardens or landscapes.