Garden Notes for July 2020.
It will soon be mid-summer and many of the earlier flowering perennials start to look rather forlorn. It may be worth your while to be ruthless and cut back foliage that is straggling. In particular, hardy geraniums, delphiniums alchemia mollis (Lady’s Mantle) should all benefit from this treatment.
July is a good time to be buying new strawberry plants, or propagate from your own runners. You should aim to replace all the strawberry plants that are 3 years or over. Remember to remove runners that are not needed.
Plant out sprouting broccoli, Calabrese, winter cauliflower, kale and Oriental greens. Place bricks or tiles under developing marrows and squashes as it helps to prevent rotting and will aid ripening.
Stake sunflowers and autumn perennials like Michaelmas daisies to help them through the time when the wind will blow. Remember to keep your mower blade raised in dry spells; allow the grass to grow to 3cm. Shade and ventilate the greenhouse.
When roses have come to the end of their first glorious flush of blooms, try to give them a feed of a complete fertilizer as this will help with the second lot of blooms. Don’t forget to dead head them as well. Outdoor chrysanthemums will also need a feed, one with a high potash content to help the flowering process.
Early crops of new potatoes, early peas and broad beans will soon be finishing, make sure to clear away the top growth as soon as possible to make room for crops like spring cabbage – a good variety is called “Spring Hero F1”, then there is Artic King lettuce which is an updated version of the reliable “All the Year Round” lettuce. There is a lot said about leaf greens, and one that is recommended for late summer sowing is Japanese Green Mizuma.
Complete leek planting as soon as possible. Sow swede by the middle of the month. Lift shallots when their foliage has yellowed and turned over. Make sure to dry them out completely before storing.
Early in the month dig up and divide dwarf and intermediate bearded irises if they have been undisturbed for 3 or more years. Tall bearded irises should be treated in a similar way towards the end of the month.
Watch out for the lily beetle. If you see any sign of damage, and apply an appropriate treatment. The beetle itself is a rather fetching shade of red, but it is their orange-red larvae that hide beneath the leaves that will do the damage.