Archives For planting bulbs

Walking around the Garden, you may see lots of holes being dug and bulbs being planted for a colorful display in the spring. But one place you may not expect to see this is the Green Roof Garden at the Daniel F. and Ada L. Rice Plant Conservation Science Center.

Green roofs are known for having lots of sedum and other drought-tolerant plants, but rarely do you see bulbs. We decided to give it a try several years ago and found that it works! So every year we plant thousands of bulbs on the north roof and hope for a showy spring display.

PHOTO: Daffodils sprinkle the Green Roof Garden in early spring.

Daffodils sprinkle the Green Roof Garden in early spring.

Planting these bulbs is not as easy as just throwing them in a hole and walking away; there are a few factors to take into consideration.

One major factor is soil depth. There are three different categories of green roofs: extensive, semi-intensive, and intensive, with a different growing medium depth for each. An extensive green roof has a depth of 6 inches or less, semi-intensive needs 25 percent of the green roof area above or below 6 inches, and intensive has a depth of more than 6 inches.

The Plant Science Center’s Green Roof Garden is semi-intensive, with depths of 4 inches, 6 inches, and 8 inches. When planting bulbs, the rule of thumb is to plant them two to three times deeper than the size of the actual bulb. This means larger bulbs like daffodils or tulips will be planted about 6 inches deep while smaller bulbs like scilla or crocus will be planted 2 to 3 inches deep.

PHOTO: Narcissus 'Little Gem'.

Miniature daffodils like Narcissus ‘Little Gem’ are a great pick for green roof gardens. Find some great mini daffodil cultivars in our Smart Gardener articles.

PHOTO: Scilla (squill).

Tiny squill (Scilla) work well in shallow planting depths.

PHOTO: Tulipa turkestanica.

Turkestan tulip (Tulipa turkestanica) is a small species tulip that is a stunning addition to any spring bulb display.

PHOTO: Tiny species tulips nestle between sedums in the shallow beds on the green roof.

Tiny species tulips nestle between sedums in the shallow beds in the Green Roof Garden.

So when deciding which bulbs we would like to see in the spring display, we must take into account how large the bulb is, and where in the Garden it can be planted. Luckily, we are able to plant bulbs in all three depths (with 4 inches being the shallowest). In the 4-inch display there are crocus and smaller species tulips; in the 6-inch area you will see daffodils, Siberian squill, and more tulips, and in the 8-inch area we have planted more daffodils and larger tulips.

PHOTO: Tulipa biflora, also known as Tulipa polychroma, is a great species tulip for the green roof.

A great species tulip (Tulipa biflora) or (Tulipa polychroma)) is a star on the green roof. Photo by Ulf Eliasson [CC BY-SA 2.5], via Wikimedia Commons

When designing where each bulb will go, we also chose how many of each we need to plant. Further back in the 8-inch area, we order larger numbers of each bulb in order to create a large sweep of color that you can see from the viewing deck. Up front in the 4-inch area, we plant several little groupings of bulbs with much smaller blooms, creating a display with a range of color.

So this spring, when you are strolling through the Garden admiring all the gorgeous bulbs in bloom, just remember: not all of them are on the ground. Make sure to come visit the Green Roof Garden at the Plant Science Center and see which bulbs decided to pop up and put on a show for us.


©2016 Chicago Botanic Garden and my.chicagobotanic.org

Planting bulbs together is a great way for children to learn about a different kind of plant. In the spring, the results are thrilling.

PHOTO: Getting ready to drop in a bulb.

James’s favorite part of planting: dropping in little “flower bombs” (the bulbs).

Put your children to work! The general rule for planting bulbs is to dig down three times the height of the bulb. For example, if you have a narcissus bulb that is 3 inches tall, you would dig a hole 9 to 12 inches deep. For smaller children, pick smaller bulbs like ‘Tommy’ crocus (Crocus tomassinianus) or grape hyacinth (Muscari).

Digging a deep hole for large bulbs can be a big job. There are several different kinds of bulb digging tools. I prefer a long, slender trowel when planting bulbs. In loose soil, you can push the trowel into the ground, pull the soil back, drop in the bulb, and then pull the trowel out. In more compact soil, I prefer a bulb trowel that looks like a metal cylinder with teeth on one end and a handle on the other.

PHOTO: Finding a worm.

The bonuses of getting dirty in the garden: finding a worm!

My son is always eager to try out my gardening tools. We make a game of planting bulbs. We bury “flower bombs” (bulbs), water the soil and flower bombs when we are finished planting, and sometimes we even sprinkle some super food (bulb fertilizer) to help things along. The hard work pays off in the spring when those beautiful blooms push through the ground, show their leaves, and then burst open with spring color.

Learn more about new additions and old favorites at the Fall Bulb Festival on Saturday and Sunday, from 10 a.m. to 4 p.m. Preview shopping for members only will take place from 10 a.m. to 4 p.m. on Friday, October 10.


©2014 Chicago Botanic Garden and my.chicagobotanic.org

Over 225 varieties of daffodils, tulips, crocus, and specialty bulbs tempt gardeners at the annual Fall Bulb Festival, presented by the Woman’s Board of the Chicago Horticultural Society.

ILLUSTRATION: Bulb planting infographic.

©2014 Chicago Botanic Garden and my.chicagobotanic.org