Req 5 — Propagation in Practice

Plant propagation is the process of creating new plants. There are two broad categories: sexual propagation (using seeds) and vegetative (asexual) propagation (using plant parts other than seeds). This requirement asks you to understand five specific methods and actually grow a plant using one of them.

Five Propagation Methods

1. Seeds

Seeds are the product of sexual reproduction. A seed contains an embryo, stored food, and a protective coat. To propagate by seed:

1. Choose fresh, viable seeds appropriate for your climate and season.
2. Plant seeds at the depth recommended on the packet (usually 2–3 times the seed’s diameter).
3. Keep the soil consistently moist but not waterlogged.
4. Provide adequate light and warmth for germination.

Advantages: Produces genetic diversity, seeds are easy to store and transport, and many species grow readily from seed.

2. Roots

Some plants can be propagated by dividing or separating their root systems. Plants like daylilies, hostas, and ornamental grasses form clumps that can be dug up, divided into sections (each with roots and shoots), and replanted.

How to do it: Dig up the plant, use a sharp spade or knife to separate the root mass into sections, and replant each division at the same depth.

3. Cuttings

A cutting is a piece of stem, leaf, or root removed from a parent plant and encouraged to grow its own roots. Stem cuttings are the most common method:

1. Cut a 4–6 inch section of healthy stem, ideally just below a leaf node.
2. Remove the lower leaves.
3. Dip the cut end in rooting hormone (optional but helpful).
4. Insert the cutting into moist potting mix or perlite.
5. Keep it warm, humid, and in indirect light until roots develop (usually 2–6 weeks).

Advantages: Produces an exact genetic copy (clone) of the parent plant.

4. Tubers

Tubers are swollen underground stems that store food and have “eyes” (buds) that can sprout new plants. The potato is the classic example.

How to do it: Cut a tuber into pieces, each with at least one eye, let the cut surfaces dry for a day, then plant each piece 3–4 inches deep in soil. Each eye will sprout a new plant.

5. Grafting

Grafting joins a piece of one plant (the scion) onto the root system of another (the rootstock). The two grow together as one plant. Grafting is widely used for fruit trees and roses.

How to do it: Make a matching cut on both the scion and rootstock, align the cambium layers (the thin green layer just under the bark), bind them tightly together, and seal with grafting wax. The connection heals over several weeks.

Advantages: Combines desirable fruit quality (from the scion) with a strong, disease-resistant root system (from the rootstock).

Growing Your Plant

You must grow a plant by one of these five methods. Here are practical options:

You know how plants grow and how to create new ones. Next, you will survey the plants that grow near your home — native, cultivated, and invasive.