The answer is fairly simple: gladiolus bloom about 10 to 14 weeks after you have planted them, usually from late June to early July, though you can get them to flower earlier in certain conditions, right through to fall. Below, we answer your questions fully so that you can work out more accurately when your gladiolus will bloom.. When to plant gladioli corms. If you live in a temperate region that is frost-free, you can plant the gladioli bulbs from winter right through to early spring. In areas that experience some frost through winter, wait until early spring to plant your bulbs. However, if you live in the tropics, you can plant your gladioli bulbs all year round.

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Gladiolus Plant Care & Growing Guide

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Gladiolus Plant Care & Growing Guide
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How to Grow Gladiolus Flowers
How to plant gladioli. Place the flat corms with the growing point facing upwards 10-12cm deep from the top of the corm to the soil surface and 10-15cm apart. As a general rule, plant them around four times the depth of the corm. Plant the corms in groups of at least 6-12 for the best overall effect, and water them in after planting.. Stage 1: Planting gladiolus bulbs (corms) Gladioli stalks can grow up to 5 feet tall, but these flowers start from small bulbs, called corms, that measure 1 to 2 inches in diameter. It's best to plant gladiolus corms in spring after the last frost of the season when temperatures reach 60 to 80 degrees Fahrenheit.
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