Frequently Asked Questions - Ornamental Plants and Flowers
In addition to their landscape uses, daylily leaves and flowers are edible. Edible materials should be gathered from only those plants that have not been sprayed with any pesticides.
In certain situations, a gardener can use herbicides to supplement other weed control strategies. Several factors limit the usefulness of herbicides in the home garden. Most home gardens contain a variety of plants in a small area. This restricts…
Most peonies require well-drained soils and full sun for best flowering. Plants need at least six hours of direct sunlight per day and a location with good air movement helps prevent foliar disease problems. Woodland peonies can…
Peony flowers are harvested for cut flowers when they are in bud, before they open. Flower buds that are showing color and are soft in the center are at the best stage to harvest for cut flowers. After harvest, flowers can be placed…
Many peony flowers have double or triple the number of petals – making them too heavy for their stems to support. Therefore, staking the peony stems as they emerge in the spring or as the flower buds are forming will provide the extra…
Mulches control weeds by preventing the germination of weed seeds. Established weeds should be destroyed prior to the application of the mulch. In addition to weed control, mulches help conserve soil moisture, reduce soil erosion, prevent…
Ornamental grasses are low-maintenance perennials. Most thrive in sunny sites and there are species that can grow in dry, well-drained, or wet soils. While small in the nursery, many can get quite large in just a couple of years, so check the…
Keeping ahead of weeds and controlling them when they are small is essential for good weed management. This requires persistence throughout the entire growing season to remove weeds as they emerge. There are essentially two types of weeds in our…
Cultivation and hand pulling effectively control most annual weeds. It is very important to destroy these weeds while they are small before they produce thousands of seeds, guaranteeing a weed problem for many years in the future.
Weedy vines are fast growing plants, getting very large in a relatively short amount of time often climbing and covering other garden plants. If left to grow, they can smother other plants blocking out light and killing the desirable plant.
Plant bulbs at a depth equal to two or three times their maximum bulb diameter. Larger bulbs like tulips, daffodils and hyacinths are often planted 6-8 inches deep. The smaller bulbs like squill, snowdrops and crocus are…
Trumpet vine (Campsis radicans) can be pruned at any time of the year. Although late winter or early spring when the vine is not covered in leaves can make the task easier. Without regular pruning, trumpet vine can quickly…
Pinch chrysanthemums 2 to 3 times from spring to mid-summer. Remove the stem tips when the shoots are 6 to 8 inches tall. New lateral shoots will develop along the stems. Pinch again when these new shoots reach a length of 6 to…
While most shrub or landscape roses are winter-hardy in Iowa, there is still typically some branch die-back over winter. Gardeners should prune out the dead wood just as the new buds are turning green and breaking in spring - typically…
The browning of the peony buds is likely due to botrytis blight. Botrytis blight is a common fungal disease of peonies. The fungus Botrytis paeoniae attacks stems, leaves and flower buds. It is most common in cool, rainy weather.
Bearded irises should be divided every three to five years. If not divided, plants become overcrowded and flower production decreases. July or August is the best time to dig, divide, and transplant bearded irises.
The centers of ornamental grasses often die as the plants get older. When this occurs, it’s a good time to dig and divide the grasses. When the grasses begin to grow in spring, dig up entire clumps, cut out and discard the dead center…
Annuals are a great way to add variety and color to the landscape and containers. As temperatures cool in late summer into fall, many of the summer annuals like marigolds, coleus and impatiens are looking “tired”. These annuals can be replaced by…
Part shade garden areas receive 4 to 6 hours of direct sunlight each day. Some annuals thrive in these conditions, and others may grow best in full sun but tolerate part shade. For these species, they may have fewer flowers or a more…
Many annual flowers perform best when they have a consistent supply of moisture throughout the growing season. However, some annuals are tolerant of dry conditions. After they’ve been planted, drought tolerant annuals may need to…
Symptoms of impatiens downy mildew initially appear as yellowing of infected leaves. The yellow-green foliage may initially be confused with a nutritional deficiency. As the infection progresses, leaves may curl downward and a white, fuzzy growth…
Cool-season annuals are annual plants that prefer cool temperatures, growing best in spring or fall. Many are tolerant of a light frost often surviving down to 28°F or sometimes even 25°F with little damage to flowers or leaves. They are great…
Cool-season annuals are annual plants that prefer cool temperatures, growing best in spring or fall. Many are tolerant of a light frost often surviving down to 28°F or sometimes even 25°F with little damage to flowers or leaves.
Leaves are an excellent resource for the garden. They break down to add organic matter and nutrients to the soil. As they decompose, they act as a mulch suppressing weeds and helping to maintain consistent soil moisture. Additionally, they can…
Some perennials emerge early in the spring. In Iowa, it’s common to have relatively warm days in early or mid-March and it is equally common to have below freezing temperatures in April or even early May. In most cases, early leaf…
