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Dahlia × hortensis

Dahlia

Dahlia

Photo: Diego Delso · CC BY-SA 3.0 · Source

This description was machine-translated.

Description

The Dahlia is a lush, flowering tuberous perennial that blooms from July until the first frost in a wide array of colors and flower forms. It produces excellent cut flowers and thrives in sunny beds. The tubers are not winter-hardy.

Care instructions

Plant the tubers in mid‑May (after the ice‑holy days, week 20) in a full‑sun location with nutrient‑rich soil. Water deeply during dry periods and support tall varieties with a stake. Regularly prune spent blooms to encourage continuous flowering. After the first frost in October, dig up the tubers, keep them dry and frost‑free over winter, and re‑plant in spring.

Soil & site

Soil pH

4.0pH 6–78.0

Soil type

humus-rich, well-drained, nutrient-rich, loamy

LightFull sun
HardinessFrost-sensitive
Water needMedium

Feeding

Heavy feeder

Companion planting

Good neighbors

carrot family (Apiaceae)

Calendula and Tagetes next to carrots keep the carrot fly away with their scent.

For example Carrotcelery rootDillParsleyCarrot fennelCoriander and 19 more species in the catalogue

Source: classic companion planting (DACH-Gartenpraxis)

Tagetes patulaTropaeolum majus

Rather not

nightshade family (Solanaceae)

Sunflowers release substances into the soil that inhibit potato tuber growth, and they also compete for water and nutrients.

For example PotatoTomatoSweet pepperCocktail tomatoEggplantCape gooseberry and 9 more species in the catalogue

Source: basic crop-rotation rule

Companion planting is partly traditional gardening lore. Where the reason is known, it is given.

Some of these explanations were machine-translated.

Diseases & pests

1 relevant

From the knowledge base, automatically linked by affected species. How to spot and prevent them is covered in full in the lexicon.

DiseasehighJun–Oct
Verticillium wilt

Verticillium dahliae

Verticillium wilt is a soil borne fungal disease that enters through the roots and blocks the plant's vascular tissue.

More on Verticillium wilt

Notes from real gardens

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