![]() ![]() Half-hardy means that the plants are frost-tender and must not be planted outdoors until all danger of frost has passed and they’ve been hardened off. They should be sown in trays in early spring and given warmth and light on a sunny windowsill, heated greenhouse or propagator. HHA - Half-hardy Annual: These plants also germinate, flower and die all in one year, but require a slightly longer period of growth.Flowers in this group can be sown directly into their flowering positions in the garden. Sown in early spring, they mature and bloom in summer, make seed if allowed to do so, then die away. ![]() HA - Hardy Annual: These plants complete their life cycle in one year.Here's a guide to the most common categories: Each group is described by a set of initials which is a shorthand way of describing a plant's growing characteristics. Image: Sunflower 'Helios Flame' F1 hybrid from Thompson & MorganĪll seeds are divided into categories, and to help you germinate them successfully, you’ll need to know which group yours belongs to. When and where to sow vegetable seeds checklist.What is damping off disease and how can you prevent it?.How to sow biennial and perennial seeds.Take a look at our complete range of seeds to see how many exciting things you can grow. Whether you want to grow your own fresh produce using our excellent value vegetable seeds or stock up on flower seeds to fill your garden with colour, it’s easy to research your options and order online. Raising flowers, plants, fruit and veg from seed is a great way to save money and there’s a very special sense of satisfaction that comes from sowing your own! This comprehensive guide to sowing and germinating seeds has been compiled by the team of horticultural experts at T&M. Follow Thompson & Morgan's extensive seed sowing guide ![]()
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