Hello! This week we want to discuss seedlings. We know just how difficult they can be to get going, so we've compiled a list of 7 top tips to get those seedlings to sprout!
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Get the timing right
The goal with seed starting is to have your seedlings ready to go outside when the weather is favourable. Start by looking at the seed packet, which should tell you when to start seeds inside. Usually, it will say something like, "Plant inside six to eight weeks before last frost."
Some types of vegetables, such as beans and squash, are best started outdoors. There is little benefit to growing them indoors because they germinate and grow quickly. Some flowers, such as poppies, are best planted outdoors, too. These seeds are usually marked "direct sow". -
Find the right containers
You can start seeds in almost any type of container, as long as it's at least 2-3" deep and has some drainage holes. If you are the DIY type, you might want to grow seedlings in yogurt cups, milk cartons or paper cups. I prefer the convenience of trays that are made especially for seed starting. It's easy to fill the trays, the watering system ensures consistent moisture and I can move them easily. -
Prepare the potting soil
Choose potting soil that's made for growing seedlings. Do not use soil from your garden or re-use potting soil from your houseplants. Start with a fresh, sterile mix that will ensure healthy, disease-free seedlings.
Before filling your containers, use a bucket or tub to moisten the planting mix. The goal is to get it moist but not sopping wet; crumbly, not gloppy. Fill the containers and pack the soil firmly to eliminate gaps.
Remember that most mixes contain few, if any, nutrients, so you'll need to feed the seedlings with liquid fertiliser a few weeks after they germinate, and continue until you transplant them into the garden.
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Start Planting
Check the seed packet to see how deep you should plant your seeds. Some of the small ones can be sprinkled right on the soil surface. Larger seeds will need to be buried. For insurance, I plant two seeds per cell (or pot). If both seeds germinate, I snip one and let the other grow. It's helpful to make a couple divots in each pot to accommodate the seeds. After you've dropped a seed in each divot, you can go back and cover the seeds.
Moisten the newly planted seeds with a mister or a small watering can. To speed germination, cover the pots with plastic wrap or a plastic dome that fits over the seed-starting tray. This helps keep the seeds moist before they germinate. When you see the first signs of green, remove the cover. -
Water, feed, repeat
As the seedlings grow, use a mister or a small watering can to keep the soil moist but not soggy. Let the soil dry slightly between waterings. Set up a fan to ensure good air movement and prevent disease. I use a fan that's plugged into the same timer as my grow lights. Remember to feed the seedlings regularly with liquid fertiliser mixed at the rate recommended on the package. -
Light, light, light!
Seedlings need a lot of light. If you're growing in a window, choose a south-facing exposure. Rotate the pots regularly to keep plants from leaning into the light. If seedlings don't get enough light, they will be leggy and weak. If you're growing under lights, adjust them so they're just a few inches above the tops of the seedlings. Set the lights on a timer timer for 15 hours a day. Keep in mind that seedlings need darkness, too, so they can rest. As the seedlings grow taller, raise the lights. -
Move seedlings outdoors gradually
It's not a good idea to move your seedlings directly from the protected environment of your home into the garden. You've been coddling these seedlings for weeks, so they need a gradual transition to the great outdoors. The process is called hardening off. About a week before you plan to set the seedlings into the garden, place them in a protected spot outdoors (partly shaded, out of the wind) for a few hours, bringing them in at night. Gradually, over the course of a week or 10 days, expose them to more and more sunshine and wind. A cold frame is a great place to harden of plants.