Growing roses from seeds is not the fastest method for propagating roses but has several advantages. Roses from seeds take a little longer but then you end up developing a new set of varieties. Professional hybridisers select a new line of easy to grow and disease resistant rose to propagate. However, for you, each seedling will be a surprise when they finally bloom. It is like opening your birthday present when you were a kid. You never really knew what to expect! That is the same feeling seeing those little seedlings opens up for the first time.
There are several processes one must follow when growing roses from seeds. For professionals, the process starts in the garden where they monitor the flowering and pollination process as they choose favorite varieties. For our case, we will start with the seed collection process.
The rose hips must be allowed to develop on the plant for at least four months for them to fully ripen. They have to be collected in autumn, cutting them off using the right garden tool. You can use cuticle scissors or tweezers to cut them off before cleaning them.
The ripened rose hip is then placed on a clean cutting board and cut in half to remove the seeds. Place the seeds in a clean container. Add some diluted bleach to kill off any bacteria and fungus spores. You can make the bleach by mixing drinking water with two teaspoons of household bleach. Stir the seeds well before rinsing them and using bottled water to remove all the bleach. To further clean and disinfect the seeds, put them in the container and add some hydrogen peroxide. The seeds can be soaked for up to 24 hours before rinsing them with clean water to clear all the hydrogen peroxide.
Soaking the seeds is a crucial step if your seeds will germinate properly and stay clear of any diseases. You MUST not mix the bleach with the hydrogen peroxide as this results in a chemical reaction. 3% peroxide for 24 hours is just fine. This is also a good time to perform the water float test. Remove all seeds that float as they might not be viable.
Starting the rose seeds
Before growing the roses from seed, the seeds have to undergo a period of stratification. This is a cold moist storage that gets the seeds ready for germination.
Chilling your seeds in a refrigerator for about six to ten weeks encourages them to germinate faster once planted. However, you must take care to avoid keeping them cold for long as they can germinate while still in the refrigerator. Place your seeds on a paper towel before moistening them. Use half purified water and half peroxide to prevent the growth of mould. You can then place them in a plastic zippered bag, mark the date and variety before placing in a refrigerator set at 1 to 3 degrees C. The paper towel should remain moist for the entire period. You can check occasionally to see if it needs remoistening. Make sure you don’t freeze the towel.
There are other ways to stratify the seeds like planting them in a tray of potting mix and refrigerating the entire tray for weeks. The tray is usually enclosed in a plastic bag to keep it moist.
Planting your seeds
When you think your seeds are ready for planting (6-10 weeks), remove the bag from the refrigerator if that was your stratification method. You will need shallow trays or small pots to plant your seeds. Whatever works between the trays and pots is fine as long they have good drainage. The ideal size of the trays or pots should be 3-4 inches deep.
You can use separate trays when planting seeds from different varieties of rose hips. You must follow your labeling all the way down from harvesting, treatment, and planting. The rose bush name and planting date are some of the details to indicate on your trays or pots.
Next fill your trays or pots with the potting soil. You can opt to use 50% sterile potting soil and 50% vermiculite, or half peat and half perlite. When the potting mix is ready in the trays or pots, this is the time to take off your seeds from the towel. Remember the seeds must not be removed from the plastic bag until they are ready to be planted. You lightly dust them before planting.
Place your seeds about ¼ inch into the soil and dust the surface again to prevent the damp off disease that kills seeds. Water them properly and place them outside in direct sunlight. If there is frost, it is advised you place your seeds under a tree or in a sheltered part of the patio to protect them. There is no need for grow lights.
Keep the soil pots or trays watered but not soggy. Do not let them dry up as this might affect the germination of your seeds.
Watch for germination
After about six weeks, the first two seed leaves will start to emerge before the true leaves can emerge. The seedling must have three to four true leaves before they can be ready for transplanting.
Planting your seedlings
When the seedlings are grown a few inches tall with at least three true leaves, they are ready to be transplanted. You can transplant them into a four-inch pot of your liking. You don’t have to plant all your seedlings but only the healthy ones. You can choose to monitor them on the tray and only transplant them when they have outgrown it.
You must monitor the seedlings as they grow in their new pots for colour, form, bush size, branching, and disease resistance. Roses with weak, unhealthy or unattractive flowers can be discarded. It will take your new seedlings at least three years before they reach maturity and develop into a big bush. However, the first flower can be seen after one or two years.
Garden tools you will need to grow your rose seeds:
• Cotton buds
• Tweezers and cuticle scissors
• Clear plastic film canisters
• Labels for the paper and plastic bag
• Wax pencil or black permanent marker pen
Growing roses from seeds appears a pretty long process but one that is rewarding when you follow all the steps as indicated. If you are a great DIY fan, then this is a nice project for you to enjoy as you brighten your outdoor space with blooming roses.