Plant Propagation by Cuttings Propagation • Process of making more plants • Two Methods Propagation & Cuttings Seed Vegetative Parts Cuttings - Method of vegetative propagation that uses sections of plant stems (root, stem, leaves) Requirements Nursery for Cuttings a. b. c. d. e. f. Good water source Wind protection/high humidity for cuttings Good growing media Containers or production beds Good plant material Rooting hormone Pruning Shears Gardening Gloves Materials and Equipment Pots or Bags Growing Media Rooting Hormone Plastic Bags Tape/rubber bands Labeling materials Plant Cuttings Should be disease free Free of weed seeds Growing Media Composting Soil sterilization Commercial mixes Examples Compost Washed sand Perlite Coconut husk Peat Moss 1. Root Types of Cuttings 2.Stem 3. Leaf Sections of roots cut from plants that naturally produce suckers from their roots Mainly used in herbaceous plants but some woody plants can be propagated as well 1. Root Cuttings Root sections should contain carbohydrates to ensure survival enough Thick roots are preferred Thin roots can be used but longer sections would need to be cut E.g. Passion fruit, Rose, Raspberry, Blackberry, Lilac 1. Gently uproot the parent plant 2. Select vigorous roots that are about the thickness of a pencil 3. Cut off 2-8 inch sections close to the crown; top cut should be horizontal, bottom cut at a 45° angle 4. Trim away any root hairs Propagation 5. Re-plant the parent plant immediately 6. Bury the cuttings about 2 inches apart; ensure that the horizontal cut is just below the surface of the growing medium 7. Place a plastic bag over the container and keep in a warm area 8. Remove the bag once a day for air circulation; keep growing medium moist 9. Checks for new roots in two weeks 10. Re-plant after a month in a larger container or in the field Advantages - Do not need special care after propagation - Large numbers of plants can be generated from each parent plant 1. Root Cuttings - Plants are usually large and vigorous - Plants are free from foliar pests and pathogens that affect the parent Disadvantages - Cannot be used to propagate variegated plants - Some plants resent disturbance - Overwatering can cause root rot The use of non-flowering sections of plant stems to propagate new plants There are four types: 2. Stem Cuttings Herbaceous - taken from non-woody plants; e.g. Thyme, Mint Softwood – prepared from soft, succulent new growth of woody plants; e.g. Crotons, Geranium Semi-hardwood – prepared from partially mature woody plants just after a flush of growth; E.g. Hibiscus, Coffee Hardwood – taken from dormant, woody stems; wood is firm and does not bend easily; e.g. Ficus, Mulberry Semi-hardwood Herbaceous Softwood Hardwood 1. Cut a 3-6 inch section of stem from a healthy plant; use a sharp knife or pruning shear and cut at a 45° angle 2. Ensure that each cutting has 2-3 sets of leaves and at least one node 3. Remove any leaves from below the node 4. Apply rooting hormone to all wounds Propagation 5. Insert the cut end of each cutting into growing medium then lightly compact the medium around it to hold it upright 6. Place planted cuttings in a semi-shaded area and keep growing medium evenly moist (not saturated) 7. Check for root development and new leaf growth every 2 weeks; remove any flowers that may have developed 8. Transfer rooted cuttings to a larger container or to the field Advantages - Fast and easy 2. Stem Cuttings - Offspring are identical to parent plant (even variegated plants) - Plants reach maturity at an earlier age Disadvantages - Lack of genetic diversity - Diseases may be passed from parent to offspring Used mainly in indoor plants that have the ability to produce adventitious roots There are four main types: 3. Leaf Cuttings Leaf-bud – cuttings consist of the leaf blade, petiole and a short piece of stem with a bud; e.g. Rubber tree Leaf-petiole – cuttings consist of the leaf blade and petiole; e.g. African Violet Non-petiole – cuttings consist of the leaf blade with incisions along large veins; e.g. Begonia Leaf portions – leaf blades are cut into several sections along the main vein; e.g. Sansevieria Leaf-Bud Cuttings Leaf-Petiole Cuttings Non-Petiole Cuttings Leaf Portion Cuttings Advantages - Uses less planting material that root or stem cuttings - Fast and easy 3. Leaf Cuttings - Best method for propagating indoor plants Disadvantages - Overwatering can lead to rotting - Plants will develop slowly at low temperatures (< 68°F) - Must be grown in well lit areas (not direct sunlight) 1. Leaf-bud Cuttings: Propagation Choose a plant with well-developed buds Cut the stem into pieces so that each cutting has a short piece of stem, a leaf and a bud Split the stem in two if there are opposite leaves Dip the base of the cutting in rooting hormone Plant it in the growing medium with the bud just below the surface Place a plastic bag over the container and keep in a warm shaded area 2. Leaf-petiole Cuttings: Propagation Choose a healthy leaf Cut off the leaf with about 1 inch of petiole Place the leaf in the growing medium at a slight angle, so the base of the leaf is clear of the surface Lightly compact the mix gently round the cutting Water with a dilute solution of fungicide Place in a warm place (do not cover with a plastic bag) Keep the medium moist 3. Non-petiole Cuttings: Propagation Take a healthy leaf Cut through a few main veins on the underside of the leaf Place the leaf on the surface of the growing medium with the top of the leaf facing upward Hold the leaf down using small stones or toothpicks (plantlets will develop where the veins are cut) Keep cuttings in a warm, shaded area and keep growing medium moist Cut the new plantlets away from the old leaf once the buds have formed shoots; re-plant in separate containers 4. Leaf Portions: Propagation Take a healthy leaf Cut the leaf into sections, each with a main vein Keep the sections in order so you know which is the top of the cutting and which is the bottom (cuttings won't grow if you get them the wrong way up) Plant the lower end of each section about 10 mm in the growing medium Place a plastic bag over the container to create a warm humid environment Roots will develop on the base of the cuttings, then buds will form Transfer each plantlet to a new container