Why Are My Grapes So Small? (Here’s What To Do)

If you are tense about your grapes being so small, then worry not! Almost everyone faces this problem once in their lifetime. It can be quite frustrating if your grapes don’t grow as you have expected.

So, why are my grapes so small? 

There are four possible reasons why your grapes are not growing. Firstly, lack of water can make your grape not grow as much to its extent. Also,over-fertilization and lack of weeding can prevent them from growing bigger. Lastly, a lack of pruning can also contribute to a lack of growth.

It’s okay if you’re still perplexed! We’ll go through each of these four aspects in-depth to see how they affect the amount of time it takes.

Why Are My Grapes Growing So Small? 

why are my grapes so small

There can be many reasons for your grapes to grow small. But there is also a variety of grapes that grow small. So apart from that if your grapes are still growing small then there could be some underlying problems.

To solve it, first, we need to pinpoint the actual reason behind it. We have gathered 4 possible reasons for their solutions. Let’s dive right into the details!

Reason 1: Lack of Water

One of the most prevalent causes for your plant’s modest size is a lack of water. The plant’s system slows down when water is insufficient. Low water levels restrict the plant’s capacity to photosynthesize. 

This can be a very possible reason behind your plant growing small.

Lack of water can also prevent your plant from growing roots in the soil. Just like a sod not growing roots in the soil due to lack of water.


Young grapes must get water between 1/2 to 1 inch each week. It may also differ depending on rainfall during the growing season. 

Grapevines, too, need an adequate quantity of land. It cannot thrive in confined spaces. It also takes 5 gallons of water to cover a 3 by 3-foot space with 1 inch of water. 

Yet, bear in mind not to flood the plant’s root zone. Excessive water in the roots can cause a variety of ailments. Except in dry or well-drained situations, elder vines rarely need to be watered.

Reason 2: Over Fertilization

Plants require fertilizer on a regular basis as they develop to maintain their general health and vitality. Although there are no standard fertilizing rules because various plants have varied demands.

So, it’s a good idea to become acquainted with fundamental houseplant fertilizer guidelines to avoid over-fertilization, which may be harmful. 

If your plants are in hanging baskets then fertilizers are essential. There are some hanging basket fertilizers for your plants

However, excess fertilizer can be hazardous to houseplants. Overfertilization can actually slow development and leave plants prone to pests and illnesses. It may also result in the plant’s eventual destruction.


To reduce over-fertilization, place the plant in the sink or another suitable spot and thoroughly rinse it out with water. Repeat as much as necessary. Remember to let the plant drain thoroughly between waterings. 

Fertilize only during active growth periods. So reducing the amount can help you avoid using too much fertilizer on your houseplants.

But, in time for the extra need for nutrition, fertilizers can play a vital role. So, here are some recommended fertilizers for your plant.

Using these fertilizers in moderation can be helpful for your plant.  

Reason 3: Lack of Pruning

Grape size is reduced if annual pruning is not performed. Its purpose is to limit the amount of fruiting canes that grow each year. Grape yield and quality suffer when grapevines grow uncontrolled.

Annual pruning, which should eliminate around 90% of the previous season’s growth. So it is critical for growing large-sized grapes without pruning.

The most common mistake individuals make when pruning grapes is not pruning hard enough. Light pruning does not support proper fruiting, but vigorous pruning produces the best quality grape. Just like treated seeds produce better quality plants.

Also, it should be trimmed in the winter and spring. The most common error in table grape cultivation is neglecting to prune grapevines each year. Grapes should also be pruned during their dormancy, which is normally in late winter.


Grapes are pruned using two methods: cane pruning and spur pruning. To prevent disease transmission, wipe the pruners with a towel soaked in rubbing alcohol before trimming each region. 

Some widely used pruners are listed here-

These products are largely used for their best pruning ability

However, if you want to produce a large amount of high-quality fruit, it is preferable to plant it on a basic frame or fence. Where it will receive enough sunshine. 

You may also consider contacting professionals if you’re unsure.   

Reason 4: Weed

To grow the grapes properly it is necessary to not have grass and other plants from growing under grapevines. This allows the soil to heat up early in the spring and maintain higher soil temperatures.

When plants grow under vines, the soil temperature stays cooler. If it goes unnoticed then weeds will create problems for the growth of grapes. 


With grapes, this will delay growth in the spring. So it is necessary to keep the ground clear of other plants throughout the growing season by hoeing gently under the vines.

Roundup’s herbicides are a good way to deal with weeds. But in case your roundup fails to work, there are alternatives. So, consider trying out the new alternatives as well.  

Here are some hand weeders recommended that will help you to pull out the weed. 

These are some of the best hand weeder tools suggested.

Hope you can relate to the mentioned problems, find the solutions here and use the tools!

Frequently Asked Questions

Question: Can my grape get bigger after the growth period?

Answer: No. Once your grapes have passed the growth period they won’t grow anymore. They will be the same size. 

Question: How to prevent potential pest outbreaks in my grapevine?

Answer: You should monitor your plant frequently and look out for any pest outbreak. Weeding and keeping the area under the vines clean can help avoid pest outbreaks.

Question: How do I know if my grapes are ripe?

Answer: The best way you can know for sure is by tasting the grape. If the grape tastes sweet then it’s ready to be plucked. Also, many variants change color when they are ripe.


With that, we come to the end of our post. Hopefully, now you have the answer to why are your grapes so small. We hope it was a good read. 

In case you have any further queries, do let us know. 

Until then, stay safe and good luck growing your grapes!

Leave a Comment

Your email address will not be published. Required fields are marked *