, written by Benedict Vanheems 
Spring is without a doubt the most exciting time of year for us gardeners, and now’s the time to get sowing in earnest! But before you so much as tear open a seed packet you’ll need to make sure your soil is warm enough and that late frosts won’t hamper your efforts.
Warming the Soil
After a long, cold winter it can take a while for soil to become warm enough for sowing. Raised beds will warm up more quickly thanks to the free-draining conditions within them, so if you have raised beds, start your first sowings here.
Any soil can be warmed up by covering it over with black plastic, row covers or garden fleece. This technique is particularly useful for heavy or clay soils that retain a lot of moisture. Black plastic works best because dark colours absorb more sunlight, creating warmer conditions beneath. Lay the plastic over the ground at least one week before sowing and soil temperatures will rise by a couple of degrees, making all the difference for early sowings.
Row covers or garden fleece can also be used to help create a warmer environment beneath them. You’ll need to secure any cover firmly into place to stop it from blowing away. Either peg it down at regular intervals – U-shaped pegs are best – or weigh down the edges with rocks or bricks.
Protecting Seedlings
Seedlings and young plants benefit enormously from some initial protection, particularly when tender plants such as tomatoes have just been planted outside, or where nights are still quite cold.
Drape clear plastic or garden fleece over recently sown blocks or rows of young seedlings. Individual plants can be protected with squares of plastic or fleece cut to size, or by using purpose-sold cloches.
Alternatively, make your own from clear plastic drinks bottles. Simply cut a bottle in half using sharp scissors, then place the top half over your plant. Keep the lid off on sunny days, or screw it on when cold weather is forecast. Don’t discard the bottoms – these can be used too, though you might want to cut a hole into the base for ventilation. Keep your bottle cloches from blowing away by pushing them into the soil or by holding them in place with a cane.
Using Water Bottles to Radiate Heat
You can also use bottles to protect young plants by filling them with water then surrounding plants. The water in the bottles absorbs heat during the day then releases it at night, warming the air around your plants. This technique is especially effective within a greenhouse, tunnel or cold frame, where the additional warmth can help tender plants like tomatoes to quickly establish after planting.
You can also fill plastic bottles with hot water on cold nights to protect vulnerable seedlings. Cluster your seedlings into a confined place such as a plant house or cold frame. Now fill gallon-sized bottles with hot water and place these into the cold frame with your seedlings. Leave enough space around the bottle for the heat to escape and to avoid overheating nearby seedlings. Tightly shut the door or lid. The radiated heat from the bottle will lift the temperature inside by a few degrees.
Polystyrene Boxes
Polystyrene boxes, such as those used in fish markets, make excellent seedling containers. The white walls bounce light back into the box, encouraging strong, even growth, while the insulating properties of polystyrene shield your seedlings from extreme temperature fluctuations. On a really cold night you can simply pop the lid on, or lay a sheet of glass or a doubled-up layer of fleece over the top.
Better still, create an instant, portable cold frame by slotting lengths of plastic pipe into the corners of the box. Then simply pull your row cover plastic of fleece over the top to create an easy-on, easy-off roof.
If you have other useful tips, please share them in the comments section below – we’d love to hear them!
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As an experienced gardening enthusiast with years of hands-on expertise, I've been deeply involved in cultivating various plants and crops through different seasons. Gardening, specifically during spring, is a passion that I've dedicated considerable time to, understanding the nuances of soil preparation, seed sowing, and protecting delicate plants from adverse weather conditions.
The article dated March 25, 2016, by Benedict Vanheems encapsulates essential information crucial for successful spring gardening. It covers various critical concepts:
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Soil Preparation and Temperature: Spring marks the beginning of the gardening season, but before sowing seeds, it's vital to ensure that the soil is warm enough and protected from late frosts. Techniques like utilizing raised beds, covering the soil with black plastic, row covers, or garden fleece help in warming the soil faster, enabling earlier sowing.
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Protection of Seedlings: Seedlings and young plants require protection, especially in colder nights or when tender plants like tomatoes are recently transplanted outdoors. Methods like using clear plastic, garden fleece, purpose-made cloches, or DIY cloches from plastic bottles shield the young plants from harsh conditions.
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Heat Retention Techniques: Employing techniques like using water-filled bottles around plants, especially within greenhouses, tunnels, or cold frames, aids in retaining and radiating heat, providing a warmer environment for delicate plants.
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Polystyrene Boxes: Utilizing polystyrene boxes for seedling containers offers insulation against extreme temperature changes. These boxes, when covered, function similarly to a cold frame, protecting seedlings from cold nights while promoting even growth.
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Additional Tips: The article encourages sharing additional tips in the comments section, promoting a collaborative learning environment among gardening enthusiasts.
The article further suggests related plant guides and articles for in-depth knowledge on growing tomatoes, managing pests like aphids, thrips, and tomato hornworms, as well as offering insights into various gardening practices like growing seedlings without a greenhouse, creating row cover tunnels, and efficient ways to keep plants warm during winter.
This comprehensive coverage provides a holistic approach to spring gardening, catering to various aspects from soil preparation to plant protection, ensuring a successful and thriving gardening experience.
Feel free to inquire if you seek more detailed information on any specific aspect or gardening technique mentioned in the article.
