Dividing a Mature Radermachera sinica (China Doll) with Multiple Trunks

A 10‑year‑old Radermachera sinica planted in‑ground for 2 years had 4 trunks. Cuttings failed. Owner asked about dividing by cutting a trunk with roots.

Feasibility

Dig first to see if each trunk has its own root system. If they join below soil, division risks killing both pieces.

If Separate Roots Exist

• Cut with a saw (or bonsai concave cutters).
• Apply Dyna‑Gro KLN Rooting Concentrate (liquid rooting hormone) to the cut piece and mother plant’s wound. Source: Planet Natural ($9.95/pint, highly diluted).
• Keep mother plant dry after separation to heal naturally; avoid cut paste (can trap bacteria).

If Roots Are Shared

Take smaller cuttings (up to ⅓ meter) and use KLN to root them. Current season (southern hemisphere summer) is ideal.