Sweet Peas, whose Latin name is Lathyrus odoratus, look fantastic as shown in the images, but smell even better as they are one of the most sweetly scented of garden plants. Sweet peas are annuals which mean they germinate, grow flower, set seed and die all in one year and so have to be re-grown each year. Sweet peas are long flowering and provide colour, scent and flowers to pick for months. Sweet peas are not difficult to grow but they need regular attention throughout the summer. I grow them every year and when in full bloom they need at least 30mins+ a week to dead head, take off the tendrils, train and tie them in. For this reason they are a red wheelbarrow plant.
To keep Sweet Peas flowering all season it is important to dead head regularly. Removing the spent flowers prevents the plant from making seed, which keeps it producing more flowers and prolongs the flowering season. Sweet peas also require attention, if you want straight stems, by removing tendrils on a regular basis, and they require watering during dry spells. The reward for all this attention is their lovely scented flowers. The most important task is to deadhead the flowers as they fade and form seed heads, this ensures the Sweet Peas flower for a long season. If sweet peas are not regularly dead headed, the blooms will get fewer and fewer, and eventually stop flowering, With regular dead heading sweet peas can flower through to November.
When planting Sweet Peas pick a sunny spot, and they like moisture retentive soil enriched with compost or other organic matter. If you encounter any problems growing Sweet Peas the most common problem is powdery mildew, a fungus which leaves white powder on the leaves. This fungus is much more likely to attack the plant if it is dry which is why it is so it is important to water sweet peas especially in any dry periods and to have plenty of organic matter in the soil to retain water. There is a Sunday gardener Video How to plant and grow sweet peas.