How to Propagate Phalaenopsis Orchids: Keikis, Seeds, and Meristem Culture

Propagating Phalaenopsis Orchids: A Beginner's Guide

Phalaenopsis orchids, commonly known as moth orchids, are among the most popular orchids for home growers. If you have a healthy plant and want to expand your collection, propagation is a rewarding project. The simplest and most accessible method for hobbyists is encouraging keikis (baby plants) to form on the flower spike.

Keiki Propagation: The Easiest Method

Keikis are natural plantlets that develop from nodes (joints) along a flower spike. They may appear spontaneously, but you can also induce them. To do so, gently remove the protective sheath at a node on the spent or active flower spike and apply a commercial keiki paste containing cytokinin hormones. This stimulates the dormant bud to grow into a new plant complete with leaves and roots. Once the keiki has developed several roots of its own (at least 2–3 inches long), you can carefully twist or cut it away and pot it in fresh orchid mix.

Advanced Methods: Seed and Meristem Culture

For those ready to tackle more complex techniques, two laboratory-based methods exist:

• Seed propagation: After pollinating a flower, a seed pod forms over several months. The microscopic seeds require sterile flasking on nutrient agar under aseptic conditions. This process demands specialized media, a laminar flow hood or sterile workspace, and months of careful replating as protocorms develop.
• Meristem (tissue) culture: This involves excising the tiny apical meristem from a growing tip and culturing it in sterile media to produce genetically identical clones. It requires even more stringent sterile technique and technical expertise.

Getting Started

Beginners should start with keiki propagation. It's low-risk, requires minimal equipment, and yields a new plant relatively quickly. For deeper learning, Rebecca Tyson Northen's classic book Home Orchid Growing offers detailed guidance on all propagation methods.

With patience and proper care, you'll soon have more Phalaenopsis to enjoy or share.