With over 2,000 different varieties of hostas their colours can range from the cool silvery blue through to deep green and bright yellow
Hostas (Plantain Lily) are plants bursting into growth now.
They have fabulous foliage with delicate architectural shapes that blend in very well with so many other plants in garden design. They may be used as ground cover or as an edge to paths and lawns. If you are a hostaholic there are 2,000 different varieties of hostas to choose from. There are dwarf varieties that only reach a few inches tall to giants that can grow a few feet tall. Hostas are available in a wide variety of colours and textures. The leaf shapes and sizes vary greatly. They can be anything from lance shaped to almost circular and can be more than 14 inches long. The leaf is often deeply textured with prominent veins and can be either matt or glossy. Colours range from the coolest of silver blues through to deep greens and yellows.
Many varieties are variegated with white, cream or gold, often with a distinct margin around the edge or streaked as if a paint brush was dragged length-ways down the leaf. Although hostas are grown for their foliage, they also produce flowers. The flowers are trumpet or bell-shaped that appear above the leaves on long stems and come in shades of purple, mauve and white. All hostas like a moist soil and generally improve in colour with age. They tend to grow best in dapple to full shade. It is important to prepare the soil well before planting as hostas are long lived and can be quite happy in the same spot for over 30 years without being divided. Add well-rotted manure or compost to feed the plant and retain moisture. Hostas may be planted in early autumn or late spring. Strong winds can damage the large leaves so they need a sheltered spot. Your local garden centre will have a wide selection of plants to choose from at this time of the year.
Garden pools have become very popular in recent years. The addition of water brings an ever changing pattern of sound, movement and reflections. A water feature, however big or small, is ideal for creating a cool, relaxing atmosphere in the garden on a warm day. Algae can be a problem in garden pools at this time of the year, turning the water into a pea-soup colour with scum floating on top. The increase sunshine increases the growth of algae. The problem can be reduced by adding a few gallons of water from a clean pond, this water contains a balance of aquatic micro-organisms that reduce the algae. Once you get the balance right do not change the water in the pond. Algae can also be reduced by growing some oxygenating plants in the ponds or putting in a fountain to increase the oxygen levels of the water so that micro-organisms can survive.
Water lilies also reduce algae, the large leaves shade the surface of the water and exclude sunlight. The water lilies also produce beautiful flowers. The best time to plant water lilies is between April and September. Algae can be removed with a sweeping brush.
Jobs for the week
May is the month when everything in the garden picks up pace, all those seeds that you planted should be growing strongly, deciduous trees and shrubs are producing new foliage and grass is starting to grow rapidly, lawns need to be cut every 5 or 6 days.
Feed your spring flowering bulbs, which have completed flowering, with a general purpose fertiliser. Permanent shrubs and hedges will also benefit from a feed.
Use a hoe to mix the fertiliser into the soil and water if the weather is dry and cover the soil with a layer of compost. Prune back the flowering stems of hellebores as soon as the flowers are pass their best. Cut them back to their base to make room for new shoots. If seedlings are required, leave a stem with a flower on it to produce seed and collect when ripe.
Protect your treasured plants from slugs and snails. There are a number of methods used to control slugs and snails, none of them are one hundred percent effective, but they help.