Sweetpea Mammoth Tall Mixed Seed

Sweetpea Mammoth Tall Mixed Seed

Sweetpea Mammoth Tall Mixed Seed (Lathyrus odoratus) produces tall, vigorous climbing vines covered in richly scented flowers across a wide mix of colours, from soft pastels to deep purples and reds. Famous for its old-fashioned fragrance, Sweetpea Mammoth Tall Mixed is a cottage garden classic that does double duty as a productive cutting flower and as a beautiful, scented climber for trellises, fences and archways.

About Sweet Peas

Sweet peas have been garden favourites for centuries, prized above almost any other annual for their heady, old-fashioned scent. The Mammoth Tall strain is bred for vigorous climbing growth and a wide range of colours, making it ideal both for gardeners who want a productive cutting supply and those who simply want a fragrant, flowering climber to soften a fence, wall or vertical support.

How to Sow Sweetpea Mammoth Tall Mixed Seed

Direct sow from September to November and again from February to April, taking advantage of two planting windows, at a soil temperature of 15-20°C. Soaking seed overnight before sowing can help speed up germination, particularly for seeds with harder coats. Germination takes 7-14 days. Provide a trellis, netting or other sturdy support at sowing time, as sweet peas are vigorous climbers that need something to grip onto from an early stage.

Where to Plant Sweet Peas in the Garden

Sweet peas are ideal for growing up trellises, obelisks, fences and archways, where their scent can be enjoyed at head height near paths, doorways and seating areas. They're equally valuable in a dedicated cutting garden grown up simple netting, and their vertical habit makes them a useful way to add height and structure to a garden without permanent planting.

Caring for Your Sweet Pea Plants

Grow in full sun or light partial shade in fertile, well-drained soil, and keep plants consistently watered, as sweet peas dislike drying out, especially once flowering begins. Tie in young growth to their support regularly until tendrils take hold, and feed occasionally with a balanced fertiliser to sustain the long flowering season. Regular picking or deadheading is essential — sweet peas will stop flowering quickly if pods are allowed to form and set seed.

Harvesting and Using Sweet Peas

Cut stems when at least two flowers on a spray are open and one or two buds remain unopened at the tip, for a vase life of around 4-6 days. Pick frequently, ideally every couple of days once flowering is underway, as the more you cut, the more flowers the plant will produce. Their fragrance makes them a favourite for indoor arrangements, even in small posies placed around the home.

Companion Planting and Pollinators

Sweet peas attract bees, which help ensure good flowering, though as members of the pea family their seeds are not edible like culinary peas. They combine beautifully with other climbing or tall cottage garden plants, and growing them along a vegetable garden fence or trellis can add fragrance and pollinator interest without competing for valuable bed space.

Common Problems and Troubleshooting

Sweet peas are rewarding but do have a few common problems. Mice are notorious for digging up freshly sown seed, so consider protecting rows with netting or starting seed in pots if this is an issue in your garden. Powdery mildew often appears late in the season, especially in dry conditions with poor airflow — mulching to keep roots cool and moist helps delay this. Aphids frequently cluster on soft growing tips and flower buds, so check plants regularly and treat early with a strong water spray or insecticidal soap. In waterlogged soil, root rot can develop, so ensure good drainage, and remember that neglecting to pick regularly is the single biggest cause of sweet peas stopping flowering early.

Frequently Asked Questions

Do sweet pea seeds need soaking before sowing? Soaking overnight can help speed germination, particularly for seeds with harder outer coats.

How often should I pick sweet peas? As often as possible — regular picking is essential to keep the vines flowering rather than setting seed.

Are sweet pea seeds edible? No — unlike culinary peas, sweet pea seeds and pods are not edible and should not be eaten.

Why did my sweet peas stop flowering suddenly? This is almost always because pods were allowed to form — pick or deadhead consistently to keep the vines producing new blooms.

How do I stop mice digging up my sweet pea seed? Cover freshly sown rows with netting, or start seed in pots undercover before transplanting once seedlings are established.

How tall does Sweetpea Mammoth Tall Mixed grow? It's a vigorous climber reaching 180-240cm, so provide a tall, sturdy support at sowing time.

Can Sweetpea Mammoth Tall Mixed grow in a large container? Yes, provided a tall trellis or obelisk is fitted for support and the container is kept consistently watered.