Sanhedrin Nursery – Garden Blog

• Tomatoes can be set out with protection. “Season Starter” will protect them down to 20°F and will give them a warm environment during the day.

• Plant sunflowers now from seed or plants. Choose either the multi-stemmed kinds for cut flowers or the giants for edible seeds.

• Gladiolus bulbs come in every color of the rainbow. Plant them this month for summer flowers.

• New rose bushes may have been damaged by the cold weather last week. Prune back dead shoots and new growth will come out to replace it soon.

• Put up hummingbird feeders this month and enjoy these colorful and entertaining birds.

Dazzling Dahlias

Diverse and versatile, dahlias are prized for their bright-colored, summer blooms. They are one of the most varied of the summer flowering “bulbs” and are actually tubers. Although native to Mexico, dahlias are very adaptable.

They come in simple, daisy-like flowers; cactus flowers with rolled petals that give them a spiky look; smaller pompon flowers with many petaled, globe-shaped blooms; and decorative dahlias with large, fluffy blooms of many pointed and twisted petals. Flowers range from 2 inches to more than 8 inches across and come in a rainbow of colors. Plants range from 8 inches to 4½ feet tall, and bloom for months.

‘Harlequin’ Dahlias have small flowers, 2-3 inches across, with a single layer of outer petals and a burst of shorter inner petals that surround the eye. Their long-lasting blooms are bicolored or solid and come in many colors.

Bedding dahlias include ‘Figaro’ Mix with green leaves and ‘Redskin’ Mix with dark foliage. They are compact and uniform with double flowers that are ideal for borders as well as containers.

The larger dahlias are particularly showy in the garden. The cactus dahlia, ‘Playa Blanca,’ produces an endless supply of white, 4 inch flowers all summer long. The cactus dahlia ‘Purple Gem’ produces excellent 4-6″ cut flowers in a rich purple from midsummer to mid-autumn.

‘Kelvin Floodlight’ is a bright yellow dinnerplate dahlia with flowers up to 8”-10” across on a four foot bush. ‘Garden Wonder,’ a bright red dinnerplate dahlia, has huge 8”-10” flowers that create an eye-catching summer show and bloom until the first frost.

‘Rosella’ is a decorative dahlia that has vivid magenta, double blooms on a 3-4 foot bush from July to frost. They are excellent for cut flowers and borders.

Dahlia tubers are planted in spring after the air and soil have warmed. They grow in full sun on the coast but need shade during the hottest part of the day, inland.

Dahlias like well-drained, fertile soil. Space roots of larger dahlias 2 to 2 feet apart, smaller types, 12 inches apart. Mix in some composted manure at planting time.

For tall varieties, drive a 6-foot stake into the hole just off center, then plant the root next to it. Place the root horizontally about 2 inches from the stake with the growth eye pointing up, and cover with 3 inches of soil. Water well to settle the soil. When the sprouts show up, in about three weeks, top-dress with fertilizer. Use as a background screen or hedge plants for a striking accent.

As the plants grow, tie each stalk loosely to the stake with soft tie material. Dahlias begin blooming two to three months from planting and continue until frost. Pinch tall-growing plants at 4 to 6 inches to encourage branching.

Dahlia’s are ideal for cut flowers, borders and containers. Their fancy flowers with their wide variety of shapes and colors will add a burst of color and life to your summer garden and home decor.

• Wildflower seeds can be broadcasted now on hillsides for colorful blooms and erosion control.

• For blue hydrangeas, apply “Hydrangea Bluing Formula” or aluminum sulfate around the plants this month.

• Broccoli, cabbage, cauliflower, lettuce and other cool season crops should be planted now for delicious spring harvests.

• Prepare for planting season! Turn in cover crops and do a soil test if your garden had trouble last year.

• Potatoes like to grow in the cool weather of spring. Plant them as soon as possible.

Lovely Flowering Cherry Trees

One of the most beautiful sights in the spring is the profusion of flowers on the flowering cherry trees. These trees have been cultivated over the centuries in China and Japan, and the Japanese have named over 120 varieties. There are about 50 varieties grown in this country, but many of them look very much alike.

The flowers are either single or double, white or pink, and on most varieties they appear before the leaves. The branches can be either upright or pendulous.

All flowering cherries need good drainage. If your soil is heavy, then planting them on a mound or in a raised bed is critical. They like full sun and some summer watering.

The most popular of all flowering cherries is ‘Kwanzan.’ The large, double deep pink flowers are over two inches across with 30-50 petals and are borne in clusters. The tree grows about 15 to 25 feet tall with upright branches in a vase shape. The new leaves are a coppery bronze, adding to the colorful display of this tree. It does not bear fruit.

‘Akebono’ cherry tree, also known as ‘Daybreak’ flowering cherry, produces abundant single pink flowers that gradually fade to white as they open. The upright-spreading crown eventually becomes an umbrella-shaped tree, 25 feet tall and wide. Glossy, dark green leaves turn bright yellow in fall. Small fruit is enjoyed by the birds.

The pink flower buds of ‘Shirotae’ open to fragrant, white semi-double flowers. Its name means “snow white” and it is considered the finest of all the double white Japanese cherries. It has a strong horizontal branching habit and grows to 20 feet tall and 25 feet wide. The variety ‘Mount Fuji’ has pure white flowers with a sweet fragrance. The new leaves are bronze, turning green in summer and yellow to orange in the fall.

The weeping flowering cherries are especially beautiful when given room to grow. They have graceful branches that sweep down to the ground, which creates a rounded form. They bloom very heavily and early.

Weeping cherries are available as high or low-headed trees. A high-headed tree is grafted at five to six feet and will bloom with a profusion of double, rosy pink flowers. They can grow to 15 feet. The low-headed variety is grafted at 30 inches and has single pink flowers. It will make a lovely six-foot mound. Be sure not to top these trees as it ruins their graceful form. These trees are grafted onto upright rootstock, and any undesirable upright shoots arising from the understock should be removed.

The flowering cherry is the quintessential symbol of spring in a Japanese garden. Flowering cherries make an outstanding focal point for any garden.

• Broccoli, cabbage, lettuce and peas grow best in the spring and don’t mind a little frost. Set out plants now and grow your own!

• Potatoes like to grow in the cool weather of spring. Plant them as soon as possible.

• Summer flower bulbs can be planted now. Choose from gladiolus, dahlias, begonias, lilies and more.

• Plant artichokes now. Fill a hole with one part humus and two parts soil and set out plants in full or part sun.

• Last call for bare root fruit trees. This is the most economical way to plant an orchard, so choose your trees now.

Growing Beautiful Azaleas

Some of our loveliest spring flowers bloom on compact plants called azaleas. These garden gems are evergreen and easy to grow given the right conditions. They cover themselves with beautiful flowers each spring and live for many years in gardens or in containers.

Azaleas should receive partial shade, or filtered shade all day. Plant them with rhododendrons, pieris, Japanese snowball or Japanese maples for a harmonious garden design.

Azaleas are fairly hardy plants, however they have a reputation for being difficult to grow. Most azalea deaths occur from faulty planting. In their native habitats they are found growing in loose, porous soils. So it is best to plant azaleas in a well-drained site with cool, moist, acidic soil.

The planting hole should be 18 to 24 inches wide but only as deep as the root ball. Use peat moss, planting mix, or ground bark to amend the soil up to 50%. Plant the azalea higher than the surrounding ground level and build up to the sides with the soil mixture. One of the quickest ways to kill an azalea is to bury the plant by putting soil on top of the root ball. The surface of the root ball should still be showing when you are done planting.

Too much fertilizer will also kill an azalea. These plants have tender fibrous roots which are easily burned by high-nitrogen fertilizers. Use a non- burning organic fertilizer like cottonseed meal or a chemical fertilizer labeled for azaleas once a month in April, May and June. Then switch to a 0-10-10 fertilizer for the months of July, August and September.

Azaleas are often the victims of overwatering. Water the plants as you would any other plant to get them established, and then check the soil to keep it moist but not soggy wet. If kept too wet, or grown in poorly drained soils, azaleas can be killed by root rot fungi. The leaves will wilt and then dry up on the plant.

Not all azaleas are hardy to the cold temperatures in our area, but there are varieties that can take temperatures down to 5°F. Look for names like Kurume and Satsuki to be sure you are buying a cold-hardy plant. Belgian Indicas and Southern Indicas will grow where temperatures don’t fall below 20°F. Below that the bark will split and the plants will die.

Kurume azaleas have very dense foliage and small flowers that completely cover the plants in spring. They come in all shades of red, pink, lavender, purple and white. Satsuki azaleas have a looser form and large flowers in white, pink or red that are sometimes striped or have multiple colors on one plant.

With a carefully chosen plant and proper planting and care, azaleas will live for many years, in the landscape or in containers, showing off their colorful flowers each spring.