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How To Grow Citrus Trees

Oct 31, 2008 -

Cultural Requirements
Planting Instructions
Fertility
Frost Protection
Pruning Citrus
Harvest

Click here to search for blog entries about citrus trees. 

Cultural Requirements

Citrus trees have lovely bright green foliage & fragrant flowers, are valuable as ornamentals or orchard trees and their fruit is an excellent source of Vitamin C.

Citrus trees are not difficult to grow but do have certain requirements that need to be met. Citrus are affected by cold and accumulated heat. Taking advantage of microclimates around your house may aid you in growing these cold-sensitive fruits.

The following lists citrus in order of most tender to most hardy:
• Lime
• Lemon
• Grapefruit
• ‘Bearss’ Lime
• Sweet Orange
• Most Mandarins
• Meyer Lemon
• Satsuma Mandarin
• Kumquat

The most tender foliage can be damaged at temperatures of 32°F, while the most hardy citrus can stand temperatures down to 18°F. Most fruit will be damaged at 26-28°F. If damaged by a frost, most citrus will still produce fruit the following year.

Citrus also need a certain level of accumulated heat in order to ripen. Since lemons are eaten for their acidic taste, they don’t need the accumulated heat in order to sweeten up and are therefore suited for cool, coastal climates. Grapefruit and oranges need a high-accumulated heat and only reach peak quality in hot inland and desert areas. Most citrus are self-fruitful, meaning they don’t need to be paired with specific varieties.

Planting Instructions

Fruit Trees are a lifetime investment and caring for them properly, right from the start, will insure years of enjoyment and productivity. The greater the investment in early care, the less maintenance that will be required as the tree matures.

• Dig a hole twice the width of the root ball.
• Place the tree in the hole so that the root crown, where the roots meet the trunk, is higher than ground level, to account for soil settling.
• Add the fill soil, mixed with high quality soil conditioner or organic matter, back in and water thoroughly.

Citrus must have well-drained soil as they are sensitive to water-logged soils. However, they need adequate moisture. If planting in containers, use a pot that is at least 1.5 ft in diameter.

A soil analysis is also recommended to determine any soil deficiencies, but this can be delayed until the tree has begun to establish itself. A gradual application of proper soil amendments will suffice if proper sunlight and drainage are available from the start.

Fertility

For well-balanced mineral soils, a yearly application of an organic fertilizer, such as Cottonseed Meal or Compost, is ideal. It should be applied in late Winter or early Spring, on the surface in a broad ring around the plant, regardless of plant size. However, in the long-term, calcium, magnesium, phosphorus and potassium along with sufficient nitrogen will significantly enhance tree health and fruit quality. The yearly addition of phosphorus or potassium or both are also important for fruit production.

Citrus also benefit from application of micro-nutrients such as zinc, iron, manganese and magnesium, if these are at low-levels in your soils. Container grown citrus might need more frequent applications of nitrogen since nitrogen may be leached by waterings.

Frost Protection

To avoid damage by frost, protect trees with Agribon Rowcovers, Tufbell Rowcovers or Frost Shield. For details, see our Season Extenders online. If trees are planted in containers, move them inside or to a greenhouse during cold weather.

Pruning Citrus

Citrus need little pruning and then only of its dead or broken branches. You may need to remove suckers from younger trees. Lemon trees need the most pruning of their vigorous branches.

Harvest

In general, the hotter your climate, the earlier you can harvest. Fruit grown on the coast ripen last. Color is not a good indicator of ripeness. The best way to tell when to harvest your fruit is by taste.

Citrus & Olives


Categories: Fruit Trees, Citrus Trees, Frost Protection, Row Covers, Pruning & Cutting Tools, Pruners


Annemarie Says:
Jan 2nd, 2013 at 12:00 pm

What about a satsuma tree that bears fruit every year but gets the size of a large pea before falling off?  What can be done?  We’ve had this tree for 4 years and it’s in a pot, in the sun.  We’ve fertilized and composted the heck out of it.  Any tips?  Thanks!

Charlotte from Peaceful Valley Says:
Jan 12th, 2013 at 6:05 pm

Annemarie, Uneven watering, rust mite, lack of potash, frost, lack of fertilizers are all possible reasons for fruit drop in citrus.

Bruce Says:
Feb 17th, 2013 at 4:31 pm

In Florida, we have citrus trees that produce fruit heavily, too much sometimes. You would know what I mean after many trips to the compost bin, garbage can to the street, or to the cow pasture. Putting a high nitrogen fertilizer, such as grass fertilizer, will cause fruit drop. To reduce the size of the backyard citrus crop, we would heavily apply a high nitrogen fertilizer. A balanced fertilizer with minor elements is imperative for a good production of citrus. 10-10-10 with minors is a good fertilizer. Houseplant/foliage or grass fertilizer is not good for fruit retention, and rust mite elimination at fruit set (x2 10 days apart after bloom) would help too.

Julie Wilson Says:
Feb 19th, 2013 at 10:48 am

My 4-year old dwarf meyer is a prolific producer with beautiful fruit. But it is a rambling bush, not a tree! Is there a method and time to prune it without damaging it? It loves our southern CA coastal conditions.

Charlotte from Peaceful Valley Says:
Feb 28th, 2013 at 5:35 pm

Bruce,

We haven’t heard of this used of high nitrogen fertilizer before.

If you push growth with high nitrogen you could indeed stress the plant to put its energy into green growth rather than fruit.  Usually it is competition between the fruitlets that causes the self-pruning.

Thank you for your advice to Annemarie.

Charlotte from Peaceful Valley Says:
Feb 28th, 2013 at 5:56 pm

Julie,

UC Davis in its Backyard Orchard section has all the answers for you wink Yes, prune a bit and they tell you when http://ipm.ucdavis.edu/PMG/GARDEN/FRUIT/CULTURAL/citruspruning.html

Deb Says:
Jun 28th, 2013 at 6:19 pm

Hello, I have a satsuma tree I purchased last year on a whim. I’m afraid it will soon be too big for me to move in and out of the house when cold weather threatens. I live in Zone 7, can this tree live in my yard? I have a full sun southern exposure yard, with a brick wall for it to receive back some heat. If I could put it in the ground, when is the best time to do so?

Charlotte from Peaceful Valley Says:
Jul 9th, 2013 at 4:40 pm

Deb, Texas A&M says, ““Satsumas’s cold tolerance extends to the mid-20s. When temperatures of 26 degrees or colder are forecast, you must bring in the plant. By growing satsumas in containers that can be brought inside, as needed,—an unheated garage will do—they can be grown successfully even in northern [Texas] areas.”

The low temperature in USDA Zone 7 is 0F so that is well below what a satsuma could tolerate, even with the warm microclimate you have clearly selected.

I think you should continue to grow it in a container and prune it to keep it a manageable size.

A good article on pruning citrus from our own county farm adviser http://ucanr.edu/sites/placernevadasmallfarms/files/134946.pdf

More satsuma info from Texas A&M here http://aggie-horticulture.tamu.edu/archives/parsons/fruit/satsuma.html

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