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A Guide To Growing Plumeria from Seeds

guide shares the basic methods I use for growing plumeria from seed, caring for seedlings, and the products I use. I hope this guide helps you with your seed goals for the year.

There are many proven methods to growing plumeria from seed and you should examine to see if any could help you develop a method that works for you. This is only a guide and should be adjusted to your seed growing environment.

When I have a batch of seeds, I examine what I did in the past and determine if I can make any improvement. The following is my detailed plan for growing plumeria from seed. This plan covers from germination until they first produce blooms.

Please keep in mind your growing environment and the differences from South Florida Zone 10B. The start of your plan should correspond to when you are past the threat of a frost or freeze. You should also make plans to protect your plumeria from cold weather, just in case you have a late freeze or frost. 

My goal is to know what, when, and why, so I can improve my method every year or even with each batch. Documenting all adjustments as you go will allow you to look back and better determine where you can make improvements.

Why I grow seedlings?
          1. To grow a new and exciting cultivars
          2. To grow rootstock for grafting
          3. But most of all to see that one-of-a-kind flower for the first time.

Using the methods and products below; I have been able to get about 10% of my seedlings to bloom in less than 12 months and about 60% to bloom in 18 to 24 months. The majority of the remainder bloom from 24 to 36 months. (Some do still take 3 years and even longer.)

What you will need: Plumeria Seeds, something to soak them in, paper towels, 2” x 3” Gro-Tech FlexiPlugs and trays or plugs or good seedling soil mix to plant the seeds in, Vitazyme, Carl Pool’s Root Activator, Bioblast 7-7-7, Pro-Mix BX Mycorrhizae, Excalibur VI 11-11-13, Labels and permanent felt tip marker. 

Seed selection

Seed selection is very important when growing plumeria seeds. Plumeria Rubra seeds do not produce true to their parents. Sometimes a seedling will look like its parent, but it will never be exactly the same.  A few characteristics to consider:

  • Flower: Color, size, keeping quality (how long it lasts after picking), fragrance, etc.
  • Tree: Growing habit, size, etc.
  • Leaves: Color, size, etc.
  • Blooming: Quality, size of inflorescence/flower stalk, number of flowers blooming at the same time, how long does it bloom, etc.

I'm always trying to improve my chances of getting that spectacular plumeria seedling.

If possible:

  • Select a pod parent that is known to produce the characteristics you desire or at least a pod parent that has the characteristics you desire.
  • Obtain seeds from trusted growers.
  • Find out the history of the pod, e.g., What’s growing close to the pod? Did they bloom at the same time? Was it cross pollinated, manually pollinated, or pollinated by nature?
  • Obtain all the seeds from a pod when possible.
  • Select seeds from a healthy tree.
  • Select seeds that are plump and look healthy.

Before you plant your seeds

Soak plumeria seeds to test viability and soften the shell to give them a kick start.

When: Plumeria seeds germinate best in the spring, but can be germinated any time if provided with enough moisture and warmth staying above 60 degrees.

What: Use quality seeds and warm water

How: 

  1. First examine each seed by placing it between two fingers. If they have some thickness, they most likely are viable. If they feel paper thin, they most likely are not viable.
  2. For faster germination and rooting, dilute Vitazyme with warm water at a rate of 1 oz to 19 oz of water, a 5% solution and dip or mist both side of the seed. Allow seeds to dry prior to planting or soaking.
  3. For a soaking mixture, dilute Vitazyme with warm water at a rate of about 1.29% or 1 oz to 128 oz (1 gallon).
  4. Place your seeds in the container, place in a warm area and allow to soak for approximately 4-6 hours (or even overnight). Soaking longer than overnight could cause damage to the seeds. Seeds that are very thin and are still floating are most likely not viable. To further test this, plant all the seeds, but mark the ones that did not sink.
  5. Check your seeds after several hours to see which seeds are absorbing enough liquid to allow germination and to sink to the bottom.
  6. Do not allow your seeds to dry out before you plant them.
  7. Now your seeds are ready to plant.

Why: 

  1. To soften the seed’s protective coating
  2. To allow the seed to absorb as much water as possible
  3. To test the viability of the seed
  4. To provide nutrients as early as possible, helping germination and starting the rooting process sooner

Preparing Plugs

When: Prior to planting seeds in the plugs.

What: 2”x3” FCN FlexiPlug peat plugs, warm water, Carl Pool's Root Activator, and Vitazyme.

How: Soak your plugs in 1 gal of warm water, 2 oz Root Activator and 1 oz Vitazyme for about 2 hours.

Why: Vitazyme is a bio stimulate with vitamins that helps the overall health of the seeds and the Root Activator adheres to the plugs or soil and give the roots a kick-start.

 I use the plugs because they hold the right amount of moisture and provide ample aeration that allows the new roots to breath.

Watering: Keep your plugs wet or leave them soaking until you are ready to plant the seeds.

Planting your seeds

When: Plant your seeds right after soaking into the prepared plugs. DO NOT allow either to dry out. If the seed dry out they could stop germination and die, if the plugs dry out they could damaged the new roots.

Plugs, Pots or Trays, After Soaking, For the seeds I grow for new cultivars, I prefer planting the seeds directly into 2" x 3" Grow-Tech FlexiPlugs, a foam peat plug. For the seeds I'm growing for root stock in flat trays.

What: Carefully selected plumeria seeds, 2”x3” Grow-Tech FlexiPlugs. Warm water, Root activator and Vitazyme. You will also need a 36-hole tray and a flats for the plugs. Cover is optional.

Why: The reason I use the plugs is they hold moisture allowing me to keep them saturated with water and nutrients, while providing ample aeration and allowing the new roots to breath. I use the 2” x 3” FlexiPlugs that allows me up to 2 months before I have to transplant to pots. The length of time depends on how fast the roots grow out of the plugs. The sooner you can transplant into soil the better.

Watering – I grow Plumeria seeds in full sun while keeping the plugs setting in water. I allow the water level in the tray to drop to about half before adding more and change the water once a week. My goal is to keep the top of the plugs very moist to the touch. I have had almost no damping off or rotting problems with this method.

Start Fertilizing – Foliage

When: Before transplanting the plugs into pots, after three or four true leaves have grown. I use the same mix ( see below) approximately every two weeks

What:  BioBlast 7-7-7 NPK fertilizer, Vitazyme

How: Foliar feeding early in the morning or late in the evening with Bioblast at 1 teaspoon and Vitazyme at 1 tablespoon per gallon of water. Do not spray in the hot sun it will burn the seedling leaves.

Why: Seedlings have seed leaves that provide them with nutrients for the first few weeks of their life, but when the seed leaves start to dry up and fall off the seedling needs nutrients. Bioblast works with every part of your plant. Soil organisms are invigorated with Vitazyme bio-stimulants providing quicker, more vigorous growth. Bioblast is a balanced 7-7-7 NPK with micros that provides the essentials of plant growth and structure. B-Vitamins and Zinc encourage a robust immune system, while Iron promotes chlorophyll production in the leaves.

Watering – I continue to grow Plumeria the seedlings in full sun and sitting in water. I allow the water level in the tray to drop to about half before adding more and change the water once a week. My goal is to keep the top of the plugs very moist to the touch. I’ve had almost no damping off or rotting problems.

Transplanting to Pots and Fertilizing

large-plug-seedling-12-days-8348.jpg

When: As soon as I see roots sticking out of the plugs, I transplant into larger pots. Normally I will use 1 gal pots, but I have used 7.5 gal squat pots. Both work fine. I think the 1 gal is a better choice due to room. Approximately 14-30 days after planting in the plugs depending on the development of the roots. Slower in the early spring and faster in the late spring and summer.

What: ProMix BX Mycorrhizae, Excalibur VI 11-11-14 with micronutrients, Vitazyme and Root activator.

How: Fill a 1 gal. pot with a mixture of ProMix BX Mycorrhizae mixed with 2 tablespoons of Excalibur Vi. Punch a whole about the size of the FlexiPlug (about 2"x3") in the center of the 1 gal pot. Place the plug in the whole  and gently press mix firmly around the plug. Water in well with a mix of Vitazyme 1 oz to 1 gal and Root Activator 2 oz to 1 gal. You may need to add more soil mix if the plug is not covered completely with at least ½” of the soil mix. Water again the next day and then when the soil is almost dry. I would suggest using a water meter from time to time to verify the moisture content. It is very important the soil does not stay wet or gets too dried out.

Why: Promix BX contains Mycorrhizae and is a fast draining mix. The Excalibur VI, a 6 month granular slow release fertilizer designed specifically for plumeria and provides all the nutrients your plumeria seedlings need to grow strong. Vitazyme a bio-stimulate helps the overall health of the seedlings and the Root Activator stimulates fast root growth, reduces transplant shock, hastens plant establishment and encourages additional root growth.

Watering – Water once a day for the first two days, then water when soil is barely moist. At this point I check with a moisture meter and water when on the low side of moist. It is important not to over water, keeping the excess soil mix from becoming water soaked. It is also important not to allow the root zone to become dry.

 

ertilizing – Throughout the growing season

When: Apply Excalibur VI every six months, Foliage feed every two weeks to every month with BioBlast. Drench with Vitazyme and Carl Pool's Root Activator every two months or if transplanted.

What: Excalibur VI 11-11-13, BioBlast 7-7-7, Vitazyme and Carl Pool's Root Activator

How: After 6 months, I spread 3 or 4 tablespoons of Excalibur VI on the top of the soil and mix in the top 1-2” of the soil. Foliage feed with BioBlast 1 Teaspoon to 1 gallon and Vitazyme 1 oz to 1 gal every month or less. Drench with Vitazyme and Root Activator in the Early Spring or if transplanting.

Why: Excalibur provide a balanced slow release fertilizer specifically designed forPlumeria Roots in 2 plumeria.  BioBlast works with every part of your plant. Soil organisms are invigorated with Vitazyme bio-stimulants providing quicker, more vigorous growth. Root growth is encouraged with Carl Pool's Root Activator. 

If possible, do not let seedlings go dormant for the first year or two. You can treat seedlings as adult plumeria after the first growing season. Seedling are mature after they have bloomed for three bloom cycles.

Keep looking for more space, they will grow!

More details on how we grow seedling for root stock and for new cultivars can be found on PlumeriaSeeds.com