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La Cobée

Cobée

La cobée est une plante grimpante vivace dans son milieu d’origine (Amérique latine), mais à cultiver comme une annuelle chez nous. Mais rien ne vous empêche de tenter l’expérience et d’essayer de la conserver d’une année sur l’autre !

Elle s’agrippera toute seule sans problème sur votre treillage ou tout autre support et l’envahira très rapidement de son feuillage abondant puis de ses fleurs violettes, blanches ou roses à partir de l’été.

Voici quelques conseils pour cultiver la cobée :

  Lire la suite

L’Ipomée

Ipomées grandes fleurs bleues

L’ipomée est une annuelle qui forme de belles lianes prêtes à partir à l’assaut de votre treillage en un temps record. Ses fleurs, de couleur bleue, violette ou rose, forment des trompettes qui s’ouvrent complètement dès les premières lueurs de la journée et se referment (quel dommage !) dans l’après-midi. Les fleurs ne durent qu’une journée mais leur fort renouvellement permet d’avoir une belle floraison constante.

J’ai pour ma part une nette préférence pour les ipomées à grandes fleurs bleues (ipomoea grandiflora)…

Alors voilà comment cultiver ces belles annuelles grimpantes :

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Le Dimorphotheca boreal

Dimorphotheca Boreal

Ils ressemblent à de petites marguerites tout en couleurs ! Il en existe des blancs, des roses, des jaunes ou oranges… Et leur coeur est légèrement bleuté. Un seul pied de dimorphotheca boreal peut former une jolie potée pour l’été. L’avantage est que la floraison dure très longtemps : pour preuve, les miens étaient encore en fleur en novembre l’année passée. 

Voici comment cultiver le dimorphoteca boreal : Lire la suite

Le Gazania

Gazania

 

Souvent utilisé en bordures dans les rocailles, le Gazania est une fleur qui appréciera également les belles journées ensoleillées du mois de juin au mois d’octobre sur votre balcon ou terrasse.

C’est une explosion de couleurs dans vos pots ou jardinières, et pour longtemps !

 Voici comment le cultiver : Lire la suite

How to grow an olive tree ?

Olivier

I repoted my olive tree this week-end… I mean when it didn’t rain (which was not much time…). It lost a lot of leaves since i received it at the end of winter, i think it is due to the big frosts of last february.

For everyone who’s still wondering it, yes it is possible to grow an olive tree into a plant tub. But of course it is necessary to know a little bit this ‘man’ and to take care of him in a proper way. If you are still suspicious, here is my little « crop advice » for the olive tree. Then you’ll just have to try by yourself ! 

 

 

Small description

Scientific name : olea

Family : Oleacees

Type : Tree

Species : ‘olea europaea’ is the most famous one; the ‘cipressino’ olive tree is a self-fertile one (that means that it can give fruits all by itself).  

Origin : Mediterranean

Height : 1 to 15 meters

Leaf : evergreen

Flowering : may/june

Harvest : olives can be harvested from september to december 

Hardiness : contrary to popular belief, olive tree can live till -15 degrees provided that cold is dry and short term. However, it is better to be careful and to protect it against winter as soon as temperatures drop under -2 degrees. 

 

 

 

Planting

when ? From march to june is the best period 

Aspect : the most sunny it can be !

Soil : a poor soil can totally be suitable for the olive tree. I planted mine in a loam for plant tub. I would advice you to mix it to « garden soil » if you can. Give it also a good drainage (sand, gravel, clay pellets at the bottom of the tub) so that it would not suffer from excess of water.

Choosing the tub : you will have to measure the size of the branches; choose a tub that makes the 2/3 of this size (diameter & depth). The roots of the tree do not develop quickly, that’s why it is not a complete madness to want to grow an olive tree ! 

 

 

 

Caring

Watering : every two weeks between octobre to march, then at least once a week (and more if weather conditions are really dry). Be carefoul though, because olive trees do not like excess of water, so leave the soil dry between two waterings.

Pruning : it is not compelled for an olive tree in a tub if your main objective is to habe an ornemental tree. If your olive tree is one of the species that are self-fertiles, you can make him a carpophore pruning just after winter (march or april) : you just have to cut the dry branches that go down and to cut mainly the inside branches so that the tree can breathe. If you just want an ornemental tree don’t do a hard pruning. 

Plant food : yes, once a week between march and september (plant food for geranium is good; i chose a specific and bio plant food for olive tree for my part.  

Insects and diseases : the olive tree fly, the black cochineal insect, stooty mold, Peacock Eye. 

  

 

 

Tricks and advices

If you want to save your olive tree from winter, and especially if you live in a cold area, protect the tub (thus the roots of the tree) with a bubles plastic as soon as temperatures drop under 0 degree. Protect also the leaves and the trunk with a wintering voile (double the layer). And take it off as soon as the weather is mild again (try to don’t leave the protection to long because plants need to breathe ! For example, when it is sunny on day, take it off and put it again when night is coming).  

  

    

 

Help !

… Leaves of my olive tree are dropping 

Did your olive tree suffer from cold ? In that case, you’ll have to make a pruning before spring. If it is not to serious, new leaves will appear soon.

… Circular stains are appearing on my olive tree leaves

It is probably the cycloconium disease (also called Peacock Eye), and mostly due to an excess of water. You’ll have to check this stain : if it is between brown and yellow and that it makes sort of rings, it is the Peacock Eye ! To fight against it you will have to cut all diseased branches, make a hard pruning and to spray what in French we call « bouillie bordelaise » (Bordeaux mixture) : it is a mixture of copper(II) sulfate (CuSO4) and slaked lime used as a fungicide in vineyards. You can also use it to prevent from disease. 

… A black film is appearing on my olive tree leaves

It is probably the stooty mold, a sugary honeydew secreted by insects such as black cochineal insects.  Treat your olive tree against these insects and wash it with black soap (trunc and leaves). You also can treat it in prevention with Bordeaux mixture.                                   

 

  

  

Money speaking…

It is often the hardest part ! You’ll have to pay around 13 USD for a young plant (between 15 and 20cm), but if you want a ‘stem’ olive tree between 100 and 150cm, it will cost you arround 65 USD, and even around 400 USD for a ‘specimen’ olive tree.   

  

  

 

AC