How to Grow Gladiolus in Pots

Select a container 12 inches deep and at least 12 inches in diameter for border or orchid gladiolus. A whiskey barrel works well for tall gladiolus. Look for a container with a flat bottom and straight or slightly tapered sides to improve stability.

Mix equal parts peat moss, perlite and all-purpose potting soil to create a lightweight soil for planters. Moisten the soil mix by spraying lightly with the sprayer on your hose.

Fill the container to within 1 inch of the rim with soil mixture. Dig holes to a depth of 6 to 7 inches with your hands for the individual gladiolus corms. Although corms are an enlarged stem and not a true bulb, many gardeners refer to them as bulbs. Space the planting holes approximately 6 inches apart throughout the planter.

Position the corms in the holes so the flat side faces downward. You may notice tiny roots around the perimeter or a shoot beginning on the pointed end of the corm.

Cover the corms with soil and press the soil down with your hands. Add soil to 1 inch from the rim, if needed.

Water thoroughly until water runs freely through the bottom of the pot. Keep soil moist to encourage root formation. Water when soil feels dry to the touch 1 inch below the surface of the soil.

Place in a sunny location that receives six to eight hours of direct sunlight a day.