Hosta 'Sum and Substance' in October: monthly care

Hosta 'Sum and Substance' thrives in partial shade but tolerates full sun better than most hostas, particularly if the soil stays consistently moist. Choose a spot sheltered from strong winds, which can tatter the large leaves. This cultivar performs best in loam or clay soil that holds moisture well without becoming waterlogged. Prepare the planting area by digging in plenty of organic matter—well-rotted compost or manure—to improve soil structure and moisture retention. The planting hole should be roughly twice the width of the root ball and deep enough so the crown sits level with the surrounding soil surface. Avoid planting too deeply, as this can lead to rot. Plant in March, April or May for the growing season ahead, or in September and October when the soil is still warm enough for roots to establish before winter. Space plants 90 cm apart to allow for their substantial mature spread of 100–120 cm; 'Sum and Substance' is one of the largest hostas and needs room to develop its full architectural presence. After planting, water thoroughly to settle the soil around the roots and eliminate air pockets. Apply a 5–7 cm layer of organic mulch such as composted bark or leaf mould around the base, keeping it clear of the crown itself. This conserves moisture, suppresses weeds, and gradually enriches the soil as it breaks down. Water regularly during the first growing season until the plant is fully established, especially if rainfall is sparse.

Hosta 'Sum and Substance' requires very little pruning in the traditional sense. The main task is tidying up foliage rather than shaping or controlling growth. In October or November, once the leaves have been blackened by the first hard frosts, cut back all the foliage to ground level. Use clean, sharp secateurs or garden shears for the job. Removing the dead leaves prevents them from becoming a soggy, slug-friendly mulch over winter and reduces the risk of fungal diseases persisting in old plant material. If you prefer a tidier appearance earlier in autumn, you can begin removing individual yellowing or damaged leaves as they decline, but there's no need to rush—the plant benefits from leaving foliage in place as long as it's photosynthesising. Some gardeners leave the autumn cut-back until early spring just before new growth emerges, which is also acceptable and may provide a little extra winter protection for the crown in colder gardens. Throughout summer, remove the tall flower spikes after blooming if you find them untidy or want to direct the plant's energy back into foliage, though the purple flowers are attractive to bees and do no harm if left. Simply cut the stems down to the base once flowers fade. This is optional rather than essential. The key principle with hostas is that "pruning" really means removing spent or damaged material rather than any structural cutting. 'Sum and Substance' naturally forms a handsome, symmetrical mound without intervention.