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USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold-hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

Spring-Planted Bulbs Guide

Planting Instructions

Drawing of hole depth
  1. Dig a hole to the required depth. Depth is measurement of space between the soil line and top of bulb or bare root.
  2. Set the bulbs or bare root in place, pointed side or sprout side upward.
  3. Cover the bulbs by replacing the soil and water thoroughly.
Bulb Planting Depth

Planting Region Map

Recommended Planting Times

Planting Region Map
  1. April - June
  2. March - May
  3. February - April

Professional Facts & Tips

  • Plant summer flowering bulbs and tubers AFTER the last frost date in your area.
  • Quality bulbs and well drained soil are the two most important ingredients to a successful Summer garden.
  • Summer bulbs require a great deal of water immediately after planting. The soil in your garden should be continually moist.
  • Sprouting is healthy; plants are anxious to get into the ground again.
  • Maintain a pH level of 6 to 7 to bring out the true color of flower bulbs.
  • Additional fertilizer is not necessary for summer flowering bulbs and tubers.
  • Many summer flowering bulbs and tubers are well suited for patio containers and should be planted closer for a full look.
  • A variety of summer bulbs make great cut flowers. Some of the taller varieties may require staking.
  • Plant your summer flowering bulbs and tubers within the season of purchase.
  • You may need to lift your bulbs and tubers in the Fall and replant next Spring. Shake off any soil and air dry for several days before storing in a cool, dry, well ventilated location. Do not store in plastic; plants need to breathe.
  • If you live in Planting Zone 3, most bulbs and tubers will survive your mild winters. Check with your garden professional if you live in Planting Zones 1 or 2 for bulbs, tubers, and perennials that are winter hardy.
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