Lyla Lindsey
Custard apple trees are widely grown in India and through Southeast Asia, and Australia is now the largest commercial producer of the fruit. The trees are grown in Queensland, Australia, and will reach between 3 and 10 meters in height depending on the variety. The trees require a warm climate, well-drained humus-rich soil, and good moisture, but not frost or very high temperatures. They are usually grown in valleys where they are protected from strong winds. The fruit is large, weighing over 0.5 kg in many cases, and is sweet when ripe. It is green on the outside with creamy white soft-textured flesh. There are two main varieties: Pinks Mammoth and African Pride. Custard apple trees can be grown from seeds, but the named cultivars generally produce superior fruit.
| Characteristics | Values |
|---|---|
| Seed germination methods | Wet paper towel method, wrapping in newspaper and storing in a cupboard |
| Commercial production | Grafted varieties on Cherimoya rootstock |
| Seedling growth requirements | Warm conditions, good moisture, protection from strong winds, well-drained humus-rich soil, mulch or lawn clippings, manure or fertiliser |
| Height | 3-10 metres depending on variety |
| Varieties | African Pride, Tropic Sun, Pink Mammoth, KJ Pinks, Annona squamosa (Sugar-apple, Sitaphal, Sweetsop, Cherimoya or Green sweetsop) |
| Pollination | Moderate temperatures, high relative humidity, adequate watering, sheltered position, hand pollination |
| Fruit weight | >0.5 kg |
| Fruit colour | Yellow to brown when ripe, green when picked |
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What You'll Learn
Germinating seeds
Custard apples can be grown from seed, but they take a long time to germinate. Here is a step-by-step guide to germinating custard apple seeds:
The first step is to obtain custard apple seeds. You can buy custard apple seeds from a local nursery or online. Alternatively, you can try to obtain viable seeds from a custard apple fruit bought from a grocery store.
Once you have your seeds, there are two popular methods for germinating them:
The Paper Towel Method:
This method involves placing 2-3 seeds in a damp paper towel. Fold the paper towel and wrap it in a plastic bag or sandwich bag. Keep the wrapped seeds in a warm place, such as on a window sill. Check the seeds regularly, and once they have sprouted, you can transfer them to soil. This usually takes about 2-3 weeks.
Planting Directly in Soil:
Another method is to plant the seeds directly in plastic cups or small pots filled with well-drained potting mix. Cover the entire pot with clear plastic wrap and keep it in a warm place away from frost. With this method, the stalk will emerge first, forming an upside-down "U" shape. The seed casing may release from the stalk on its own, or you may need to help it pop up and remove the seed casing manually. Make sure to keep the soil moist by spraying it with water every day or so.
Regardless of the method you choose, custard apple seeds prefer warm and moist conditions. They grow best in well-drained, humus-rich soil and thrive in subtropical and tropical climates. Keep in mind that custard apple trees can grow quite tall, so if you have limited space, consider growing a dwarf variety.
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Choosing the right location
Custard apple trees require a warm climate and are typically grown in Queensland, Australia, where the temperature ranges from 25°C to 28°C. They thrive in tropical to subtropical climates and are sensitive to frost. Therefore, when choosing a location for your custard apple tree, select a spot that receives ample sunlight and is protected from frost and strong winds.
In terms of soil, custard apple trees prefer well-drained, humus-rich, deep soil. They are often grown in valleys, which provide natural protection from the wind. If you have heavy soil, consider planting on mounds to improve drainage. Additionally, the custard apple tree will benefit from a sheltered location with some shading, as too much direct sunlight can be detrimental.
When deciding on a spot, keep in mind that custard apple trees can grow quite tall, reaching heights of 3 to 10 metres, depending on the variety. Ensure you have enough space to accommodate their spreading growth habit.
For those with limited space, dwarf varieties are an excellent option, growing to about 2 to 3 metres tall. These can be more easily accommodated in residential gardens while still providing a plentiful harvest.
Lastly, consider the microclimate around structures such as buildings and sheds. Custard apple trees have been observed to thrive when planted near these structures, possibly due to the added shelter they provide from sun and wind.
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Soil type and fertiliser
Custard apple trees are native to South America, but Australia is now its largest commercial producer. They are grown in subtropical and tropical climates, and can grow up to 8 metres tall. Dwarf varieties are also available, which are perfect for residential gardeners, as they only grow to about 2 metres tall.
When growing custard apple trees from seeds, it is important to use well-draining potting mix and keep the soil damp. The soil should be kept moist, but not too wet, as this can cause the seeds to rot.
Fertilisers are concentrated sources of plant nutrients that can improve growth. They are available in various forms, such as liquids, granules, pellets, or powders. The three most important elements that plants need for growth are nitrogen, phosphorus, and potassium. Nitrogen supports vegetative growth, phosphorus helps with healthy root and shoot growth, and potassium boosts the production of flowers and fruit.
There are two main types of fertiliser: organic and inorganic. Organic fertilisers are made from plant or animal sources, such as seaweed, bone meal, and chicken manure pellets. They take time to break down in the soil, releasing their nutrients slowly over several months. Inorganic fertilisers, on the other hand, are man-made using chemical processes. They are usually more concentrated and faster-acting than organic fertilisers, so they are good for giving plants a quick boost.
When choosing a fertiliser, it is important to consider the NPK ratio, which indicates the proportions of nitrogen, phosphorus, and potassium. This will help you select the right fertiliser for your custard apple tree's needs. For example, a tomato feed high in potassium will have an NPK ratio of 4-3-8, containing 4% nitrogen, 3% phosphorus, and 8% potassium compounds.
In addition to fertilisers, good soil management techniques such as regular mulching and the addition of compost and soil improvers can also benefit plant growth.
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Watering and humidity
Watering Techniques
The custard apple tree, also known as the sugar apple or cherimoya, thrives in warm and moist conditions. It is essential to provide adequate water to the seeds and young plants. One recommended technique is to keep the soil damp by spraying it with water every day or so. This ensures that the soil doesn't dry out completely, which can be detrimental to the germination process and early growth stages.
Humidity Considerations
Custard apple trees generally prefer a warm and humid climate. They grow well in tropical to subtropical regions, with ideal temperatures ranging from 25°C to 28°C for optimal fruit set. High relative humidity is crucial for successful pollination and fruit development. However, it is important to note that heavy rain can also hamper pollination, so a balance is necessary.
Soil and Drainage
Custard apple trees prefer well-drained, humus-rich deep soil. They are typically grown in valleys or protected areas to shield them from strong winds. In areas with heavy soil, it is recommended to plant them on mounds to improve drainage. The addition of mulch or lawn clippings around the base of the tree can also be beneficial, as it helps retain moisture and promotes healthy growth.
Seed Germination
When germinating custard apple seeds, some gardeners recommend using the wet paper towel method. This involves placing the seeds in a damp paper towel, folding it, and then wrapping it in plastic to keep it warm. Alternatively, you can plant the seeds directly into plastic cups or small pots filled with potting mix, keeping them warm and covered with clear plastic wrap. This provides a mini-greenhouse effect, helping to maintain humidity and warmth for germination.
Regional Differences
It is worth noting that custard apple trees grow best in the hotter, drier, and sandier areas of northern Queensland, such as Cardwell, Chillagoe, and Almaden. They thrive in these conditions and seem to produce better fruit in drier localities. However, young plants in their first six months of life can benefit from some shade, and they seem to naturally gravitate towards shaded areas, possibly for protection from the sun and wind.
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Sunlight and temperature
Custard apple trees are native to tropical and subtropical regions, with Australia as their largest commercial producer. In Australia, custard apple trees are grown in Queensland and northern New South Wales. They are a tropical to subtropical fruit and thrive in warm conditions and good moisture.
The trees require moderate temperatures, ideally ranging from 25°C to 28°C for optimum fruit set. They do not fare well in very high temperatures or frost, and they require a well-drained, humus-rich deep soil. They are usually grown in valleys where they are protected from strong winds, and they benefit from being planted on mounds to improve drainage.
When growing custard apple trees from seeds, it is important to note that they require a significant amount of time to germinate. One method for germination is to wrap 2-3 seeds in a wet paper towel, then fold and enclose them in a sandwich bag. Keep the package warm, and in 2-3 weeks, sprouts should appear. Another method is to plant the seeds directly in plastic cups or small pots filled with soil and covered with clear plastic wrap, kept away from frost.
Once the seeds have sprouted and been transferred to soil, they require partial sunlight. In Brisbane, Australia, one source mentions keeping the plants in a spot that receives some direct sunlight for about half the day. Another source mentions that in North Queensland, custard apple plants benefit from some form of shading, especially during their first six months of life.
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Frequently asked questions
Custard apple seeds can take a long time to germinate, with a minimum of three months and up to 12 months.
The paper towel method is commonly used for germinating custard apple seeds. Wrap 2-3 seeds in a wet paper towel, then fold and place them in a plastic bag. Keep them warm and wait for germination.
Once the seeds have germinated, transfer them to well-drained soil. Keep the soil damp and ensure the plant receives adequate sunlight.
Custard apple trees require a lot of water. It is recommended to water them daily.
Custard apple trees are typically grown in tropical and subtropical regions of Australia, particularly in Queensland and northern New South Wales. They can grow to be quite tall, so ensure you have sufficient space or consider a dwarf variety.
