Cucumber Telegraph Improved is a reliable, well-established OP variety, which is very often used for plant sales by garden centers.
SOW: early May
HARVEST: August
WHERE TO SOW: Cucumber can be sown indoors in pots of compost, or outdoors in open ground. Our method below describes sowing indoors and then moving outdoors, which is what we advise. Cucumber prefers well sheltered sites, where the soil is not prone to drying out.
Cucumber is best sown indoors in 5cm pots in mid April. Sowing 2 seeds 1cm deep, on their edges, and then removing the weaker seedling after germination. Harden off and plant out seedlings end of May or start of June. Leave a minimum of 40cm between plants if they are climbers, or 75 cm if they are trailers.
A good tip is stagger the planting out the seedlings over several weeks, to spread out your harvest time 12 to 14 weeks after sowing.
Tip: Sow 2 seeds in each drill with the pointed end downwards! Keep well watered.