Geranium care: watering, diseases & Co.

Geraniums impress with their colorful flowers. With the right care - the right cutting, watering and fertilizing - diseases can be avoided.

Pelargonium (Pelargonium, also geraniums) belong to the cranesbill family (Geraniaceae). Most of the 250 or so game species are native to South Africa, but came as early as the early 16th century. Century to Europe. They were mistakenly included in the genus at that time Geranium classified. Pelargonium and Geranium however differ in the flower structure. Pelargoniums owe their vernacular name as geranium to this taxonomic faux pas. Since its successful entry in Europe, the geranium has not only been established linguistically as such, intensive breeding has also resulted in new color variants. The flowers of the numerous varieties shine from May to the first frost in an attractive color spectrum from white to red to purple. But it's not just their appearance that makes them one of the most popular bedding and balcony plants among Germans. They are also less susceptible to diseases and pests, can also dry out and can be reproduced and overwintered very easily. In summer you can therefore see the colorful variety of their flower carpets on almost every balcony. But so that your own balcony, like the balconies of the typical Upper Bavarian wooden huts, shines in a sea of ​​flowers, the care must be right.

Geraniums are not exactly maintenance-intensive. But in order for beautiful flowers to appear in large numbers on strong shoots, your geranium needs a lot of fuel in the form of water and regular fertilization. Reaching for scissors also strengthens healthy growth and is essential before wintering the South African beauties. So that you can keep your balcony darlings happy, you will learn everything about watering, fertilizing, cutting and wintering geraniums in this article.

Water geraniums properly

Geraniums not only devour nutrients, they also need a lot of water. Geraniums can indeed dry out without being damaged, but they only bloom particularly profusely if they are regularly watered with room-temperature rainwater. However, care must be taken that the plants are not constantly wet. Therefore: it is better to pour vigorously once than more often with small amounts of water. Do not water again until the soil has dried and avoid waterlogging.

Summary of watering geraniums:

• Water regularly and vigorously
• Avoid waterlogging

tip: If your geraniums look limp and withered despite sufficient watering, this may be due to root damage caused by waterlogging.

Fertilize geraniums properly

Geraniums are among the heavy eaters. This, combined with frequent pot cultivation, means that you will not be able to avoid fertilization. You should fertilize the hungry plants from the time they are planted until well into October. You can use the following fertilizers for geraniums:

• compost and Horn shavings
• Specific Flower fertilizer
• Mineral fertilizers like Blue grain

When planting, you can choose one Slow release fertilizer like using compost and horn shavings. As a rule, three liters of compost per square meter and a handful of horn shavings are worked into the potting soil. After that, you do not need to fertilize for three to four weeks. Instead of compost or horn shavings, you can also work a primarily organic long-term fertilizer into the soil.

When choosing fertilizer you should make sure that the nitrogen content (recognizable by the "N" of the NPK ratio) should be higher. The phosphate content (P), on the other hand, should be the smallest. Our Plantura organic flower fertilizer is the ideal choice. It consists mainly of organic components. In this way you not only protect the environment, it also protects the microorganisms in the soil supported, because the nutrients are in complex form and must first through the soil life be open-minded. This means that organic fertilizers also have a natural long-term effect. You only need to fertilize once in the spring and top up every now and then. Mineral fertilizers are given in the irrigation water every one to two weeks. How exactly you do with the Fertilizing geraniums procedure, you can read here - you will also find valuable information on the nutritional needs of exotic species.

Summary of fertilizing geraniums:

• When planting slow-release fertilizers such as compost, horn shavings or Organic fertilizer use
• Subsequent fertilization occasionally; mineral fertilizers: every one to two weeks in the irrigation water
• Our recommendation: mainly organic fertilizers with a high potassium content and phosphate like ours Plantura organic flower fertilizer use

Cut geraniums properly

Geraniums are generally very well tolerated when it comes to pruning. With standing geraniums, you can create smaller and larger tall trunks or bushes through shaped cuts and let your creativity run free. Those who live creatively on a small footing can be content with clipping off the tips of the new shoots from spring to early summer. So the plants don't shoot into the herb. The mother plant is stimulated to branch and the clipped shoots are ideal for pulling cuttings. You can find out how this works below.

In weeks with high rainfall, there is an increased risk of rot or mold formation on withered flowers. To avoid this, you should regularly remove (clean) the faded inflorescences by hand. This additionally strengthens the formation of new flowers, because the removal of the flowers suppresses the formation of seeds and new flowers sprout. It is ideal if you carry out this maintenance measure on a weekly basis. In a certain subspecies of the hanging geranium (Pelargonium peltatum) cleaning is not necessary because they clean themselves. The varieties are particularly popular 'Cascade' or ‘Villetta’.

The last time in the year the geraniums are cut back in September / beginning of October before they are moved to their winter quarters. The long, unwooded shoots are shortened to about ten centimeters, leaving two to three knots per shoot. In addition, all leaves are removed. After successful wintering, the spring pruning takes place at the start of budding (around the beginning of February). Since geraniums bloom on the new shoot, radical pruning leads to a particularly large number of flowering shoots.

Summary of how to cut geraniums:

• In summer: Occasionally shorten the shoot tips for a better growth habit
• Weekly: Clean up dead flowers to minimize the risk of mold and rot
• Beginning of February and September / October: radical pruning

tip: If, when pruning hanging geraniums, one or more main shoots are left out and only the If you cut back branching branches in spring, you can use them as climbing plants keep.

Wintering geraniums

Unfortunately, geraniums do not survive the frosty winters outside of their sunny African homeland. So that you can still enjoy your geraniums for years to come, they have to move to the protected winter quarters before the first frost. This is ideally a dark, cool room such as a basement. Your geraniums will stay there until spring after the following preparation:

• Carefully dig up the geranium
• Gently knock the soil from the roots
• Cut back as mentioned above
• Cover the roots in a pot or bag with sand and potting soil
• Place the geranium in the winter quarters

It is only poured in such a way that the root ball does not dry out completely. There is no fertilization at all during the winter rest.

More details on the Wintering geraniums, you can find out in our special article.

The most important geranium diseases at a glance

With the right site conditions and proper care, geraniums are free-flowering plants. The following pests or diseases can nonetheless occur.

Geranium rust in geraniums

The susceptibility to geranium rust is particularly increased when the leaves are wet. You can recognize an infestation by the fact that the leaves turn yellow to brownish and pustules sometimes appear on the underside of the leaves. Spots or rings are visible on the upper side of the leaf and spread quickly. Since geranium rust is contagious, you should remove the affected leaves as soon as possible and dispose of them in the event of an initial infestation. You can also support the plant with a plant tonic and should absolutely avoid watering the plant from above. The geranium should also be protected from rain.

Botrytis in geraniums

With the so-called Botrytis (also called gray mold) is a common fungal disease. Similar to the geranium rust, there is an increased susceptibility in wet and cold weather. If your geranium has rotten spots with a gray coating of spores, it is most likely affected. Then you should first remove the infected parts of the plant and, in principle, keep the plant drier. Spraying bio-active ingredients with field stalks and oats provides additional strengthening.

Aphids on geraniums

Even Aphids often target geraniums. Infestation often occurs in winter quarters when the plant is dark and does not grow much. By sucking the aphids, the geranium leaves curl, making the infestation recognizable. If it is the first aphid infestation, rinse the geranium thoroughly with water. If they occur more frequently, you can also fight the aphids with soapy water.

Spider mites in geraniums

While gray mold and geranium rust usually occur in wet weather, geraniums can grow in dry and warm weather Spider mites be infested. The infestation can be recognized by silvery dots on the upper side of the leaf and webs on the underside of the leaf. In most cases, it is sufficient to spray the geranium with water and treat it with a plant tonic.

Whitefly on geraniums

Geraniums are particularly susceptible to infestation in warm, sheltered locations and in winter quarters white flies. The pests settle on the underside of the leaves and cause yellow spots on the leaves when they suckle. Affected leaves then dry up and fall off. To combat it, you should remove infested leaves and if the infestation is low Yellow panels attach. Parasitic wasps are well suited for natural control by beneficial insects.

Summary of the most important geranium diseases:

• With geranium rust, the leaves turn yellow to brownish; partially pustules appear on the underside of the leaf; spots or rings are visible on the upper side of the leaf and spread rapidly; contagious
• If botrytis or gray mold are infested, rot areas with a gray layer of spores appear
• Aphid infestation can be recognized by the wavy leaves
• Spider mites leave silvery dots on the upper side of the leaf and webs on the underside of the leaf
• White flies settle on the underside of the leaves and cause yellow spots on the leaves by sucking; affected leaves dry up and fall off

This special article also tells you what to do if your Geranium yellow leaves exhibit.